User settings are cleared when I log in
 

When I logged into my XP user account today my desktop was reset to windows default & my files were missing from my documents folder. I tried to search for my files but I could not find them. I added some desktop icons but when I rebooted they were lost. I noticed that my documents folder pointed to "documents and settings/TEMP". I have now found that my user folder in documents is still there and my files are there but I am worried that I may have a virus. I need to know how to stop my user account being reset when I log in or whether I should reload windows from scratch after saving my files.

Thx b4.