blue screen +password screen

  dawntreader 16:15 29 Jun 2008
Locked

hi,this is for a friend,he had a new unit built about 3 mths ago,and kept getting a blue screen every now and then,when restarted,ok,
i found they had used the old h/drive as a slave,but left the old xp on!i formatted this,and every thing seemed ok,reinstalled xp,and every thing seemed ok,but now all he gets is the startup screen asking him for his password,and even when entered,dosnt do anything,even in safe mode,it just goes back to this screen?
befor he had probs,he has fixit,and when he did a scan,there was a question mark next to the video card?could this be the prob?and how to solve,as cant get into system.
thanks

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