After having a problem with my pc a couple of days ago (the problem behind resolved by removing a faulty ram module and its twin), it quickly came to a complete halt after restarting attempting to install updates on a newly installed vista ultimate x86_64 system. I am able to access the bios/cmos perfectly fine, and the POST tests complete with no problem. It is when I attempt to boot vista from either my hard drive, the vista setup from dvd, or even xp setup from cd that it simply freezes (after showing the initial loading screen, and "please wait..." message).
There have been no recent hardware changes besides stripping and cleaning the system (to which I am quite confident I have made no error); the original heatsink and fan that came with my chip used a heat conductive pad rather than paste, however during cleaning I lubricated the chip with arctic silver 5.
The system was in a working state after the two ram modules (2x512mb) where removed, and was left with another (2x512mb) set of modules but just stopped working.