unlocking 4th core

[shaolin95]

bingo has been stating all along that 64 bit is a lot harsher than 32 bit, I trust his info.

Chew, I have been using a dual boot Vista64/XP for a while now, OCing all my systems and this is the first time I cant boot into Vista. The problem is, I cant boot to vista64 even if I load optimal settings and try completely at stock so its not an overclocking issue.
Its either the ACC or perhaps something else I am thinking about.
I would go for that theory if I could boot to Vista at stock speeds but not even that. Plus I have had the same OCing speed in all my other rigs for both XP and Vista so all the evidence, at least with my systems, show that neither is better at OCing.
Regards

PS Update: I was able to flash to the beta bios and got it to show only 3 cores and still couldnt load vista 64 so I assume somehow my Vista installation got damaged in one of my previous attemps at booting at too optimistic settings.
I hope I can repair it.