Thnx for your response.... It is a desktop model in a fine condition (8 years old p4)and I never upgraded it with new hardware... my whole pc is 8 years old. Few days back it was hanging for 5-7 seconds consistently and then pc would become normal and now it is getting serious. whenever I am browsing or working on something suddenly it becomes freezed and then nothing works... keyboard, mouse, numlock nothing works even if I try to press ctrl+alt+del it doesn't work becoz keyboard also get freezed. To get rid of it I switch off the main power and have to boot it up again. After booting, everything would become normal but after 2, 4, 7, 10 minutes or 1 hour this problem occurs again.
Is it something wrong with the connectors or something wrong with registry or should I format windows.