installing vista/ram issue

[skidude]

Ok i had to reinstall windows last week and when i went to install windows xp pro i kept getting errors while it was copying files so i though the disk was bad so i got windows vista unlimate and i keep getting blue screens while installing it

I have been having ram/mobo issues off and on where the pc won't post inless i only have 1 stick of ram in the mobos a1 slot sometimes i have to bend the ram some to get it to turn on? Also sometimes it will post with 2-3 sticks in but the dual channel will not work

When installing vista i can get to a mem test screen and the tests loops over and over inless i put it on the adv test mode then it locks up at 21%

pc spec's
ASUS L1N64-SLI WS Dual L (1207FX) NVIDIA nForce 680a SLI MCP SSI CEB AMD Motherboard

2x AMD Athlon 64 FX-74 Windsor 3.0GHz Socket F (1207 FX) DSDC Processors

Thermaltake Toughpower 1200W W0133RU

2x Western Digital Raptor X WD1500AHFD 150GB 10,000 RPM 16MB Cache Serial ATA150 Hard Drive

CORSAIR Dominator 4GB (4 x 1GB) Timing 3-4-3-9 Voltage 2.4V

sound Blaster X-Fi XtremeGamer Fatal1ty Professional Series

2x
BFG Tech BFGR88768GTXOCE GeForce 8800GTX 768MB 384-bit GDDR3 PCI Express x16 HDCP in sli

SAMSUNG 226BW Black 22" 2 ms (GTG) DVI Widescreen LCD Monitor