I would check the MB manual to see what is going on(what the beep code means).
Almost has to be bad timing. After all, Windows is simply software and should NOT be able to effect the bios(ability to post).
Please use the debug led panel to see what number the system gets when it freezes. Page 29 of the manual starts to list the debug codes.ftp://126.96.36.199/manual/P67%20Pro3.pdf