Thank you, I think you posted in my z77 thread, i got the same "The file iastor.sys is corrupted", so I gave up for now. The AMD 990FX works much better, including USB 3,0, ASMedia 6 GB SATA, 8-core CPU and superior fan control. Check my thread on "Sabertooth", it's a straightforward install, no need for trickery. I still don't understand how win2k can use more than 4 GB memory, and wireless is still win2k's Achilles heel. Also Win2k Disk Management creates misaligned partitions with new disk technologies, and I'm concerned that the w2k AHCI driver may not be fully compatible with newer disks.