Hey I have a Q6600 overclocked to 3.2. Currently I am running 32 bit Vista Ultimate, if I were to install Vista 64 bit my overclock wouldn't make anything unstable would it?
Kind of a silly question, but we're all entitled to them once in awhile.
So long as your overclock is truly stable you should run into no issues installing Vista. As far as Vista is concerned you simply have a 3.2ghz processor.