Driver error?

[MistaUNGA]

I built my system a LONG TIME AGO. I started building it early in '02 (it's my first build) and got it to run. However, I would get frequent restarts and system lock-ups. I finally figured out that I needed to put paste between the CPU and the Heatsink (what a concept, I know), and that seemed to cure the problem. My computer finally became stable and able to stay on for days on end if necessary. Recently, though, I've been having similar problems again. My computer will restart for no reason, and I'll get the little window asking to report an error to Microsoft. When I do, I get the typical Microsoft bullsh*t "Error caused by a device driver" but I never am able to find out which driver. Perhaps somebody could shed some light?

Specs (keep in mind I started building in '02 before you laugh):

AMD Athlon XP 1900+ (Clocked at 1.6 GHz)
768 Mb DDR RAM 266 MHz
MSI KT4V Mobo (I upgraded to this from another, crappier Mobo)
G4 Ti4200 64 MB DDR (Driver dated Aug 2, '05, version 7.8.0.1 according to Device Manager)
Philips Sound Card 605 (5.1 Surround Sound Card; I've checked for newer drivers, but there are none since like '03)
XP Home SP2

I've tried searching the forums for this type of topic and found nothing. Any other info required I will be happy to produce. Thanks in advance for the help!
Cheers!

 

[discochan]

When you say your system was stable do you mean that it stayed on and everything seemed fine or it was Prime 95 stable for at least 24 hours?

 

[MistaUNGA]

When you say your system was stable do you mean that it stayed on and everything seemed fine or it was Prime 95 stable for at least 24 hours?

I don't know what you mean by Prime 95, but it would stay on for over 24 hours and be just fine,