How do you get SLI to work in Vista?

Hello everyone. I am having a problem getting SLI to work in Vista. When I enable SLI there is no increase in FPS in the games I play. SLI kicks ass when I boot to XP. I tired installing 169.25, 169.28, 169.32 even in safe mode and still no increase in FPS. I have latest bios, latest nforce and gforce drivers. I also disconnected every component not needed to run a game, sound card etc...

What is the trick?

My system

evga 680i sli NF-63
2 evga 8800gts 320mb
core2duo 6550
2 and/or 4 gigs patriot xtreme performance ddr2 800 (tried both)
silverstone OP650
Vista Ultimate 64 with all updates

There are some patches that Microsoft has offered for SLI in vista that you can't download from windows update. You said that you have all updates; do you have SP1 installed? I'm pretty sure the SP includes the SLI updates. If you do, then I'm not sure what your issue is. I have the same OS (with SP1), and SLI runs just fine for me.

The one problem though, is that SLI does not always return an increase in FPS, and can actually decrease performance. The only reason I suggest this is because you apparently dual boot, maybe the games that you are running in vista don't actually benefit from SLI (which can happen even if they have SLI enabled in their profiles).

I hope my suggestion for grab SP1 helps, but if you already have it, I'm sorry that I can't assist you. Good luck!