quickest solution , i feel is to reinstall XP .Immediately use AV.
If u have files on that drive where XP is, try to get someone elses HDD and do it.
EDIT : Before trying the above method first
And can u try the same in the safe mode < tap f8 while startup > .also try a system restore to a date when system was working fine. and dont foreget to DO AV CHECK
If u have files on that drive where XP is, try to get someone elses HDD and do it.
EDIT : Before trying the above method first
And can u try the same in the safe mode < tap f8 while startup > .also try a system restore to a date when system was working fine. and dont foreget to DO AV CHECK