My PC setup: - MSI K8N Sli nForce 4 mobo - 3800+ Athlon 64 XP processor - ATI Radeon PCI Express 16x X1600 - 1.5GB RAM etc etc - 200GB SATA HDD I had the same problem as you guys with the whole nvraid.sys. However, I don't have multiple drives, just one 200GB SATA drive. It just refuses to allow me to install Windows. However, on my CD, there was a "Promise 376/378 driver" for Windows XP. I remember my old MSI board used that to help install Win XP, so I tried using that when it asks "Press F6... etc" - Voila, it worked. I had also turned off all RAID functions in Bios, both Silicon and nVidia RAID. Only problem I have now is that when I'm on Windows XP desktop, sometimes while doing various things, the pc just restarts for no reason whatsoever, like just restarts without warning (On desktop one second, next second I see the MSI logo cause it had restarted), bam. Can anyone help with that? Could it be a motherboard problem? The Win XP installation itself? Anyone have experience in this matter? Would appreciate any advice. Thanks.