How To Recover a Damaged User Profile in XP

this is simiular but? It is DEP which as one boots upthings look normal until just a blue screen(on mine)and a small microsoft window(there is a virus of sorts in your operational system etc.). I tried virul? antivirus from Norway. No help.after read Microsoft explanation(DEP). I do the control,alt,delete and in the task window,down below on the right(new task) type: explorer.exe. and lo &behold everything turns back to normal.But have to do all over again at the next boot.xp pac2, was using avg, zonealarm, and another.Doesn't matter which windows,