Memory dump

[tontod]

I recently upgraded to an Epox 8RDA and XP 2200+. The temp seems to be running kinda hot, like 50's celsius. As soon as I boot into windows I get a blue screen and a memory dump. I think its heat related because the first time when I booted it (after it was shut for a while), I was in windows for about 10 minutes before the blue screen/memory dump occured. I turned the heatsink around just in case it wasnt seated properly. It still dosent help. Any ideas on how I can fix this? I bought a bigger heatsink (thermalright sk-800(u)), hoping that will help.