Computer Lockups

[Astro33]

Recently the computer kept on locking up while I was typing up something in MS Word. I have no idea why. Occasionally the computer used to lock up once in a while during games and other applications. I thought it was the sound driver for SB Live value, which I did not upgrade but just used the one that came with XP Pro. I thought it was because of overclocking (it would not cold boot at 133+ FSB), so I made everything default which is just P4 1.6a. However, the lockups continued as I worked on my document. I don't understand why there would be lockups with no program besides MS Word running. I scanned for viruses with the most update NAV 2002 and nothing came out that seem to be the cause for system lockups. Could it be that previous overclocking has damaged my CPU? I checked the temperature and it never went above 49C-50C. I cannot believe this lockup problem is occuring again. I built this new computer because the same problem was happenning on the old system. The 'old' components that I am using for this new system is the sound card, NIC, mouse, keyboard, dvd rom, floppy, an 18 gig IBM hdd. Does anyone have any ideas? I am not even certain this is OS problem or hardware problem. One thing though, when lockup occurs, the USB MS Intelli Optical would shut off its lights. I am not sure if that will happen for any type of lockup. Not quite sure how the mouse power is regulated. If this is not the place for this help. Please let me know of a good place. I dont want to go to local best buy because its 60 dollars an hour and dont think they have 100% guarantee for repair. The OS and the whole computer was setup using the new 80 gig hdd. The 18 gig IBM drive was put attached later after all installation was completed. Please help. Thanks.

P4 1.6a (was at 2.3 @ 1.575 V now back to 1.6 and default V)
Asus P4B 533 w/audio/usb
512 MB Samsung PC2700
80 gig WD hdd, 18 gig IBM hdd
Gainward gf4 ti 4200 64 MB
Toshiba dvd rom, floppy
3com NIC
sb-live value