Random BSOD on Vista 64-Bit

My situation is that I am getting random BSOD on Vista 64-bit even when my PC is idle. I get a message that says something like Special Pool Memory Corruption so I decide to run memtest86+ for my 4 sticks of 1 GB ram (2 are ballistix DDR2 800 and other 2 are tracers DDR2 800). I ran memtest when they were OC'ed, stock speed, for each stick and each slot but memtest did not find any errors. I've also tried reseating the RAM and running just 1 stick which will be fine for a few days then the random BSODs will start to happen. I have Windows Server 2003 (32-Bit) installed on the same PC and I can leave it on for weeks without getting any BSODs. Anyone have any suggestions on what I can do and if it really is my memory that's the problem? Below is my computer specs and software that maybe causing the problem.

Thanks


Specs:
ASUS M2N-SLI Deluxe with AMD dual-core 1.9 GHz
2 x 1 GB Crucial Ballistix DDR2 800 RAM
2 x 1 GB Crucial Tracers DDR2 800 RAM
eVGA 8800 GS
Creative Sound Blaster Audigy SE

Some relevant programs ran during startup:
Vista Service Pack 1
Kaspersky Internest Security 2009
WinPatrol
Super Anti-Spyware