Hi,

My initial gut feel is that it is a software problem, rather than a hardware one, so it might be malware.

The upgrade from Me might be part of the problem. Have you tried a re-install and take the repair option? You might have to go into bios and change the boot sequence first to boot from the CD?

Your last resort will be to format the HDD and reload XP. This will tell you if the drive is damaged? As you were running Me, it is not a new drive?

What is the make and model of machine you are using?
Was the upgrade, an upgrade, or a new installation?

Cheers