Zorrowannabe9

Okay I recently altered my computer.
My new setup is:
ASUS P5N-E SLI motherboard
E6600 Core 2 Duo
2 Gigs of Corsair DDR2 800 (5-5-5-18)
eVGA 8800 GTS 640mb

My problem is it is constantly locking up or blue screening while playing games. The RAM is supposed to be "optimized for SLI" I no longer have an SLI setup, so would those timing now be problematic? If not, can you think of any other possibilities, Ive already tried drivers for video card etc.

Games that are crashing are BF2, BF2142, Oblivion, CS, Gmodd...basically anything

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Computer Specs:
Cooler Master Ammo 533
SilverStone Strider ST60F Modular PSU
ASUS P5N-E SLI mobo
Intel E6600 Core 2 Duo 2.4Ghz
CORSAIR XMS2 2GB (4 x 512MB) DDR2 800
2 eVGA Geforce 7800GTX (SLI)
- 2 NV Silencer 5 Rev. 3 VGA coolers
Seagate Tech. 120 gig HDD
3Dmark06 score: 7823