Hello, I was hoping if anyone could help me diagnose a recurring problem I've been having with my computer. I just did a fresh format hoping to rid myself of these BSODs but I'm still getting them quite frequently now, and they always seems to occur when I am running multiple programs (usually a video game and IE in the background) or if there's lots of sound going on (like in video games and music). This kind of hints to me that it could be my sound card or my RAM, but running several memtests on the RAM has shown no signs of anything wrong. My current setup is:
Gigabyte GA-K8N51GMF-9 Motherboard
AMD Athlon 64 X2 Dual Core 3800+
Patriot 1GB PC3200 400MHz (2x512MB) Dual Channel DDR
Nvidia Geforce 8600 GTS 256mb
Soundblaster Audigy SE
I have also attached the minidumps too. I tried to read them myself with the dumpchk but I had no idea how to use it once it was installed

If anyone can please help me diagnose this problem I would appreciate it so much. Thanks.