Guys, thanks your your help, my pc is now error free. Formatting did the trick. Initially, i was suspecting virus problems and so got the hardware wala home and he suggested formatting but i tried scanning the hard drive first. Recycler had infiltrated my hard drive so i enabled SuperHidden files and performed a boot time scan using avast 5 which detected 25 unique viruses with a whole lot of other stuff. after that the PC felt much free but ultimately i formatted my drive once in for all. Thanks for your help. There is however another thing that i need help reguarding.. the hardware i mentioned in the first post were purchased last month and i have to pay Rs.32000 for it. I feel i am being charged a lot extra. Please tell me the exact price of the hardware for details here is the link *www.thinkdigit.com/forum/showthread.php?t=126792