QX9650 @ 4.0 Ghz
2 GB Gskill DDR2 @ 800 Mhz (stock basically)
of course Maximus II Formula @ 400 FSB
Cooler Master Real Power 850W PSU
Auzentech XPlosion DTS sound card
Creative X-fi Music sound card
Areca RAID controller

I just noticed that Windows Explorer has crashed the last couple times I started the computer. ???

Keep in mind, this has only happened since putting in this new GPU. Is there any way other than PSU that the GPU could be affecting the rest of the system like this?