Asus P5N32-E SLI PLUS, minus SLi?

So I've got me a new P5N32-E SLI PLUS motherboard. I plug the fucker in, rig everything up (including my 2 7600GT's), boot it, install XP, bung on the drivers for motherboard and 3d card(s ) - only to find that SLi is nowhere to be enabled. I have that asus flexible SLi bridge installed, so it's not a complete nub issue like that. Any ideas?

The mobo documentation tells me to install the cards (in specific slots out of the 3 available, which i did), install the bridge, and fire away. then, enable the SLI in the nvidia control panely thing. the hardware side i can do, the software side i just can't. it's not there, and i know what i'm looking for, having enabled it on the old motherboard i was using last time. so, the mobo documentation is useless. the 3d card documentation is non-existant (galaxy).

Asus' technical support page is a massive load of Too Long; Didn't Fill Out.

>>1
How many times did you reboot to get to a fully installed state?

>>2
I've rebooted umpteen times and re-installed both the motherboard/nvidia chipset and nvidia 3dcard/forceware drivers maybe 3 times each.

>>3
Wow, Windows rocks.

>>4
So do you.

Anyone? Or do I go back to trawling through google results...