This should get you going:
306084 - HOW TO: Restore the Operating System to a Previous State in Windows
XP (
http://support.microsoft.com/?id=306084).
--
J.C. Hornbeck, MCSE
Microsoft Product Support
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Jason said:
I currently was infested with some virus threats, and in the process of
removing them i deleted a file known as bsst5. I think that is the name,
anyway its a file that windows xp uses. Now it is gone. What im trying to do
is restore my computer to a earlier date when the file was there but im not
sure how. Any information would be appreciated in this matter thank you
Jason.