Knowing Errors occurred in the System(xp)

Launch Event Viewer from Control Panel -> Administrative Tools.
Note: You can also go to Start -> Run and enter "eventvwr.msc" in the Open box to Launch EventViewer.
Look in the Application branch for events with a source of Userenv and ID of
1517 or 1524.
If you find those errors, download and install the User Profile Hive Cleanup
Service.

User Profile Hive Cleanup Service
http://www.microsoft.com/downloads/details.aspx?FamilyId=1B286E6D-8912-4E18-B570-42470E2F3582&displaylang=en

Double click on Drive open a popup box to select a program to open(virus)

Hai When you double click on the drives like c: or d: It pops up a dialog box and asks to select a program to open then it is a virus.
So Just Download PRT tool from www.sergiwa.com or search it in google you will find lot of links to download it and double click the software your virus is gone.