Reason being the HT frequency is related to the SATA ports so if you **** that up then windows is screwed.
Not on his board. The sata ports are locked. I think it may be all nf4, I forget. Nf3 boards generally have 2 locked and 2 unlocked, but all his are. It's the RAM and CPU screwing up with all the restarts and blue screens and whatnot that can screw up the HT in his case.
Also, you may consider each of your ram sticks. Run memtest86+ for a couple hours on each stick and make sure they each can get in windows and maybe some 3dmark05 and whatnot
if it's your PSU, a multimeter is handy to have in order to test the rails yourself since software can be faulty sometimes. Mine DFI Ultra-D reads at 11.77v on the +12v rail, but if I test it with multimeter it's on 12v even.