i'm using windows XP sp2. my computer will work properly for few weeks after installation of fresh copy of windows. but suddenly my hard disk starts making some sound like something is obstructing the rotation of the disk inside. then suddenly system hangs and bule screen error appears or system will restart. after restart the problem grows bigger. windows will take decade to load and system will become very very slow and using computer is like a hell. even copying files takes upto 90% of cpu. i got this problem several times and some time i installed fresh copy of windows again. now the process repeats. it will work fine for some time and hdd makes sound and so on. plz help me... is there is any problem with my HDD?