When did the problem begin to occur? Did you already attempt using System Restore to go back to before the problem started? Do you have access to another Windows XP machine or CD where you could get a fresh copy of the file?
I have the same problem as Wyane. I have tried to install a new system image and I get the same problem of a freeze at mup.sys. I have tried to start with a xp cd but it freezes at starting windows. Any ideas?
That is the problem I can not get to that point in the install. I have a E machine and it comes with an image file of the system. I have another machine with xp pro but when I boot from cd it freezes at starting windows and I do not get to the option to repair.
I had this problem as well it turned out not to be the mup.sys file that was the problem... it actually loaded it was the last file in the series... what actually fixed my problem was a registry entry that tells xp to look for another keyboard... I changed the 1 to a 0 and viola... booted right up...
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I have been running a multi boot system (Win 98 SE and Win XP Pro) without a problem for about a year and a half in a computer I built myself. No problems whatsoever – everything ran fine. Ten days ago I lost the motherboard. Since then I have built a new computer with the plan being as follows:
A. Install Win XP on a new hard drive in the new computer
B. Install the old hard drive as a slave drive in the new computer
C. Copy my data files from the old hard drive as needed
Unfortunately, I am unable to install Win XP on the new hard drive. Halfway through Windows Setup the graphics are reset automatically, the screen becomes unreadable, and I lose track of what the heck is going on. I could, however, install Win 98 on the same hard drive with the same computer without any problems.
After scratching my head for a while I wondered what would happen if I put the old hard drive in the new computer – I figured the Windows XP Activation process would detect massive hardware changes and require a new authentication. Ok, that’s a small price to pay for saving my data files.
Now it gets interesting. Using the old hard drive I can get to my Win 98 OS, but NOT to my Win XP OS. It starts to boot and then fails with no diagnostic info whatsoever. If I reboot to Win XP in Safe Mode I see the last file loaded is – MUP.SYS.
Doing a Google search on MUP led me here. I have also tried using the Win XP Recovery Console to disable the MUP service as suggested in “Windows XP Inside Out”. No luck – same result with the only exception being MUP.SYS is not displayed.
So.. this leads me to think the NEXT process after MUP.SYS may be the culprit. But, since I can’t “get” that far – I don’t even know what it is.