I am having similar issues as this:
However mine is a little different.
Here is the Scenario, I have 512MB PC2100 DDR ram. I put another 256MB of PC2100 DDR Ram. And things crash. I take that out put in another 512MB PC2100 DDR Ram of Like and unlike types this produces better results however the programs still crash after a little while. I take both the 256 and either of the 512 sticks and everything works fine. Other than the ram my hardware looks like this:
Soyo Dragon K7V Plus Motherboard
240 Gig of various drives (three 45 gig drives, two 20 gig drives, and an 80 gig drive)
ATI Radeon 8500 64MB DDR Retail
Adaptec 2940 UW Controller
HP SCSI 40x (Plextor Rebadged)
Pioneer 16x DVD Rom
And some other odds and ends.
Of course 512MB 2100 DDR Ram to 1.25 gig.
Internet Explorer Crashes and has to restart IE not the computer. And Medal of Honor Allied Assault crashes and has to restart the game not the machine.
RTCW crashes has to restart.
C&C Renegade crashes and has to restart.
So this is a big issue with my computer.