Try booting a cd rom running windows pe and run chkdsk. If you can't mount the drive running windows PE, then the disk is physically damaged beyond something your likely to be able to fix.

Only other suggestion is download a diagnostic disk from the maker of hard drive and run diagnostics on it and see if the hard drive manufacturers utilities can fix it enough to boot.

A BIOS update fixed my problem ^^

btw i use Asus m2n-e

The next file after Mup.sys is update.sys,

I got p**sed off with Windows after 3 days of it freezing and erased update.sys, after that it installed fine 100%.

how to:
-----------

>recovery console
>cd system32
>cd drivers
>erase update.sys

then restart.

Stick that up your **** bill!

I wanted to extend to you a formal and hearty thank you for the info posted regarding the issues with "MUP.SYS". I was able to successfully recover very important data on my system after experiencing similar booting issues and following the instructions on your post. Thank you very much Mr. Clark.

Regards,

Christopher Conner

My solution: strip system down to bare bones, ie remove all cards except the graphics card, remove all drives except the boot disk, remove all periferals, usb devices and the mouse, remove all memmory except 1 simm. XP loaded OK.

Replace all items one at a time. My problem was with my DVD drive, don't know why yet. I now have system running with every thing connected except the DVD drive.

Hope that helps someone.

Hey, I'd like to thank everyone who has posted on this forum.
My computer started having similar problems and I fixed it following suggestions on this forum. Here's what worked for me.

My computer has got a 40 Gb master harddrive partitioned into one drive with the windows 98 OS (FAT32) , one with Windows Xp OS (NTFS) and one data drive (FAT32). Also attached is a data slave (120GB).

While trying to solve some problem with the Windows 98 software the computer technician has messed up the Windows xp system. He then created the blunder of reloading Windows Xp a second time without deleting the original Xp installed.This happened in Novemeber. I don't know whether it had got something to an error he may have created or the fact that there were two Xp Oses loaded (though I don't know how he managed to do it) my computer suddenly froze at the Windows Splash screen last weekend and I found
while loading in the safe mode that nothing would load after mup.sys.

While googling this error I found this really informative forum.I know practically nothing about computers as its generally my bro or the techie who fixes problems.But my brother is abroad and I don't trust the technician anymore so I tried a few things that I thought I could manage.

I used the Windows Xp original Cd to boot the comp and went to the recovery console. chkdsk showed no errors but chkdsk /p did. I tried the chkdsk /r function after that. Though this initially did not yield anything I tried booting my comp normally and went to another room (which had a spare comp) to continue reading the forum.When I went back to my room the comp had loaded Xp and was running perfectly.

I ran a virus scan overnight before which i retarted the comp several times, all of which were successful.No virus was found too. But the next morning when I tried restarting the comp I got the dreaded error again.

I could not figure out how to make changes in the BIOS. Could not find the options to check whether APCI etc was enabled or not.

So back it was to chkdsk and the like. This did nothing for the problem anymore. I tried a repair install of Xp. But like it happened for several people this Repair install would hang at 34 minutes. I tried one last ditch attempt at just letting the install run. Five fours later it was down to 29 minutes. After ten hours of starting it , it reached 9 minutes and just would not complete regisering components.I left it overnight this way and there was still no progress

Now I was really badly stuck coz I knew if I would restart my comp it would try to complete the repair install and hang again. So seeing no hope i decided to format the Windows Xp OS partition. Luckily I never keep any data on it so I had nothing to lose.

I booted the comp from the Win XP cd . I did not choose repair option when it found old xp, and chose the load fresh windows xp option. The format and load was successful but I had to reload all the applications and programs again etc. But I guess it is a small price to pay.

The comp still is running fine today...its been three days and I am counting my blessings. I still am not sure I found the coz of the error but I have sworn off my computer technician.

I hope this information helps someone.

Thank again for all the tips and help

Take care

I forgot to add....my computer had started acting real wierd after I had had to install and uninstall ipod updater and itunes a whole load of times .Made my dvd rom and cd writer crash twice because of some registry entries that itunes makes when it is uninstalled. I had fixed these crashes thanks to google but do you think that this install uninstall business caused some registry corruption that lead to this error??

The comp seemed to work fine despite the two loaded win xps and this is the only really major change that had happened before this freezing at the splash screen error.

Its a shot in the dark but what do you know...someone might actually have an answer!

I am currently having my 2nd duel with mup.sys. I have 3 computers, one WXP laptop, one WXP pc, and one multi-boot system split between Win98 and WXP. The multiboot system has had the problem both times.

Last time (about a year ago), the problem happened when my mom accidentally plugged in 2 keyboards at once; a wireless one with the receiver in a USB slot, and a normal one in the keyboard slot.

When we rebooted it next, it wouldn't load normaly, so I tried safe mode. It killed itself with about 30+ errors. I rebooted again and went into safe mode, and it hung at mup.sys. Then I came here on the laptop, and after reading pages 1-3, took out the CMOS battery for a few hours and then put it back. Everything worked fine.

A couple of days ago, the same kind of thing happened. I lost my mouse, and so I tried to use the computer without one. Then when I found the mouse, I put it in when the computer was still on. But this time, when I rebooted it, I couldn't access the bios or safe mode, as it said "Error loading OS", and I don't have an XP cd to reinstall/repair/use Recovery Console with.

I also can't get the system files off of any other computers, because when any of my networked computers tries to access system folders, it denies access. And I can't boot off of my Win98 because the video card, USB card, router and modem, 2 of my cd drives, my keyboard, monitor, printer, speakers, mouse, and 95% of my programs are installed on the WinXp part, since most of it is new and I haven't used the Win98 in a few years.

I'm thinking it's the same as before, but mup.sys has not yet shown itself. Any suggestions?

I was struck by this earlier today, and still can't figure out what caused it.
My solution to this was:
1) Boot from XP disk
2) Start recovery console
3) chkdsk c: /f
This found and fixed a few errors, rebooted the machine and Horray - It worked...
Now to back everything up

Zancor La Duca said: Well, no, it's not the same as before, because instead of hanging at mup.sys (which occurs when Windows begins to load, then fails part-way through), you are getting a message saying "Error loading OS" (which occurs when the BIOS can't even get the OS to start loading).

I recommend you start a new thread for this problem, as it's outside the scope of the mup.sys issue.

This fix worked for; however, I had to reinstall XP SP1 again to do it.

1. Instal XP SP1
2. Apply Critical Update KB885626
http://support.microsoft.com/kb/885626/en-us
3. Update to SP2

Hi, You guys ready for another mup.sys problem??!?!?

Right,

I installed a cheapy new pci tv card, and it worked ok for about half an hour.
Then i had a big crash, so did a reboot and windows froze and the screen went black after the win xp startup screen.
I tried a few times, took the pci cards out one by one, still wouldnt boot.
I run 2 hard drives, one 120gb maxtor for windows and apps, and a seagate 300gb sata for files.
I figured id just reformat the 120gb drive and reinstall windows.
did this and installed raid thingy and then rebooted, same blank screen problem.
When i unplug the SATA cable to my seagate drive it boots fine.
Is it possible that installing this stupid tv card has screwed the sata on my motherboard?

I have just ordered a sata usb drive enclosure so i can hopefully rescue my data on my seagate drive.

Any recommendations what i should try? this is really frustrating me! " title=">">


the mobo is asus

My comp is still Freezing up at mup.sys, When my 2nd SATA Drive is Connected.
I have tried 3 different SATA leads, Reset the CMOS, and even Changed the Motherboard and its still the same. This is soo annoyin, can anyone help me?
I am tempted to smash it to bits and buy a mac

joe jowers said: You changed the mobo?? Did you use exactly the same model, or did you use a different one?

When you say "3 different SATA leads", are you talking about cables or mobo headers?

The SATA cables that ship with drives are notoriously cheap and flimsy. I saw somewhere that they're only rated for 5 connect/disconnect cycles. I've had three of them go bad on me just from pushing them around while making other connections inside my case.

A couple of ideas:

1) Have you tried clearing the CMOS on your mobo? That's an easy thing to try.

2) If you're using an old case/PSU, you might be overtaxing it. If you're using a beefy PSU, then unless it's really cheesy, it's probably okay. If you have another one lying around handy, it might be something to check. (I had almost the same signature you're getting: If either or both of my two oldest drives were plugged in, it'd hang during boot. I was at wit's end, until a friend suggested a new PSU. Swapped it out, and it worked like a champ.)

Good luck.

Thanks for your reply,

I had a different model mobo hangin around that used to be in the pc, had same problem with it.
I have a cheap 500 watt psu installed , but i have a spare around so could try that,
Have tried resetting cmos, no joy.
The SATA cables i tried were brand new ones shipped with the drive.
When the computer starts up it recognises the drive before it tries to boot to windows.
The drive definetly has power tho, i can feel it whirring, and it doesnt make any weird noises.
I think it could have screwed up cos i had to turn the pc off by the button when it crashed.
If the drive was knackered would the problem i am having occur? or would it still boot and tell me there is a problem with my drive. (ive never had a hard drive screw up on me so dont know what happens)

I guess i wont know if the drive is ok until i try it in an external usb enclosure.

joe jowers said: Okay, that's not a surprise. WinXP does not take kindly to having the mobo swapped out from underneath it--you have to subsequently perform a "Repair Install" to get the proper set of core drivers applied for the new mobo/CPU. More info here:http://support.microsoft.com/kb/824125

In one case I had (bad IDE cable), I saw the same behavior--good in BIOS, hang during boot. If I waited long enough (15-25 minutes), the "hang" would eventually clear and the boot would finish. Once I got to the desktop, I could access the drive just fine--read/write still worked. But if I unplugged the drive, it would boot right up without a hang, and once I replaced the IDE cable, everything was good again.

I have had multiple SATA cables fail, including "fresh out of the box" cables. I can't say strongly enough just how cheap those cables are. If you put any kind of strain on them, or bend them too tightly, you're asking for trouble. Is your boot drive a SATA device? Try swapping the cables and seeing if the problem sticks with the drive or follows the cable.

Well, first off it's relatively unlikely that your power-button-reset damaged the drive. Even if it did, media errors on a non-boot drive should not affect the boot process. They'd most likely manifest as issues when you tried to access the drive once boot was complete.

Well i got a hard drive enclosure today, and whaddayaknow,
The drive worked fine right away, what a weird problem!?

I have run a chkdisk onthe drive and it seems fine,
might try connecting it back to sata in my pc at somepoint, im gonna keep it external for a while now tho, ive had enough time inside my pc for one week!

I've had this same problem on my system which is a HP Pavilion dv5000 lap top.

When booting up in the safe mode, the last line on the screen has to do with MUP.SYS then it freezes. I've run the hard drive test from the bios and it passes. HP furnished two disks with the system - one called Operating System DVD and one called Application and Driver Recovery DVD. I can get the system to read the Operating system dvd where I get a prompt to press F2 if I want to do a system recovery. If I press F2, I'm prompted to place disk 2 in the floppy. I don't have a floppy drive, so I place the other disk in the cd/dvd drive and hit enter. The system again instructs me to place disk 2 in the floppy drive. If I don't initially hit F2, the dvd/cd drive starts down loading drivers from the Operating System dvd, then tries to start windows, and freezes up. HP has replaced the 2 disks but the new ones get the same results.

So, I can't get to the recovery console or get far enough along to load another mup.sys from another machine.

I'd appreciate any help.

David

So I just fixed my mup.sys problem.

My fix did not involve anything with hardware although the problem did start with hardware.

My computer has been crashing because my cpu randomly overheats since the fan broke Ya, i know, its bad. Anyway. The other day it crashed and corrupted my 'system' file. There's a huge other thread on these forums about this problem. Anyway i followed the MS KB instructions and replaced my system,sam,security, etc. files with the REGISTRY_MACHINE_* files stored in the system restore directory. Oh, and one thing to note: I couldn't log into my recovery console because for some reason the password was corrupted and it kept on asking me for a password although the admin password was blank. So I did all this using System Recovery Disk, which basically is an awesome portable linux distribution that allows you to edit NTFS partitions.

After finally making sure they were actually written to the disk, i rebooted, and it started to boot up but hanged on d347bus.sys. I went and researched this and found out it was related to daemon tools. So i deleted the file, rebooted, Then it started hanging up at mup.sys. I read everything and figured out that it wasn't actually mup.sys but was hanging up at another file after it. So i started unloading, deleting, etc. and NOTHING worked. I moved everything back to how it was before, (except i kept the d347bus.sys deleted)

Then i went back and decided i'd try to load the registry_machine_* files again, but this time i tried another more recent (like two weeks ago) system restore directory.

And it worked.