[Highly Offtopic Answer]
Sushan, dude, listen.
For the last couple of days u r coming with a lot of problems to us...no,no I'm not discouraging u or telling that we can't solve them...BUT...I think the time has come when u should REINSTALL XP again.
End all of them once and for all.
Wat say??
U might not like my reply as I'm not telling anything that may be any of ur help. I again say, backup ur important data and reinstall XP. And this time the first thing u install b4 installing even d drivers, is A GOOD ANTIVIRUS(AVG8 would do d job).
[/Highly Offtopic Answer]