Harrison Valdo said:
...Yesterday the Hard disk was writing a backup while Vista was installing the updates; at the end of the proceure windows restarted automatically and the problem began again!!!....
By this explanation, I'm interpreting it to mean that you were performing a backup of your system disk to the external disk, and while that was going on you (or the system) started updating Vista OS. Then when the updates were finished, but the backup was NOT finished, the system rebooted?
If that's the case, then it sounds similar
to what caused your initial problem. Definitely not the same, but similar. Major processes may have been interrupted in an uncontrolled manner when the update forced the reboot. Of course if my interpretation is wrong then that doesn't apply.
A 'restore' and
repair action seems like your best first option. You should probably also reinstall any drivers if any came with the external disk, but if it were me I'd probably simply delete them and rely on Vista's native drivers.
Also, I generally don't trust 3rd party backup software when it is packaged with an external disk, as manufacturers are always trying to do things as cheaply as possible. The exceptions would be if it came from a well known quality manufacturer like Seagate (which includes Maxtor now).
If some no-name backup software is what you used I'd try something else like freeware DriveImageXML or similar. For personal use, I prefer DIXML even over Windows' backup programs on all Windows platforms.
DriveImageXML even provides a video tutorial for people new to computers, and other users have created their own tutorials/hints also available on YouTube. In other words, lots of help if needed.
For interim backups of key data folders I also like Karenware's "ptreplicator". Both programs run on XP, Vista, and Win7 as well. Other members I'm sure will provide other recommendations.
edit to add: Some format changes and provide links to some more user-generated DIXML tutorials and info
An Web site about DriveImage (external link)
A user's tutorial (external link)
Another user's tutorial (external link)