Appreciate the reply IC. I followed the advice shown but Im still getting the error messages. The last one mentioned 'BAD POOL CALLER',whatever that is. I think Im getting somewhere though coz Ive had ongoing system problems for about 2 years now. I posted a topic about it on this site actually. Up till now,when my system went down, it would freeze up completely and I'd get this looping crackle from my speakers. At least now my pc is responding to it and giving me some feedback.
I'm not sure how your bios is set up, but reducing the memory speed/refresh rate, to a slower rate may solve this problem.
Systems will lock up if the memory is really being pushed. Select a slower speed and see if the lockups stop. Usually selecting AUTO solves the problem.