VGA BIOS's can certainly get corrupt... although im not sure whether its possible to while ur loading stuff... i woulda thought its main "danger" time would either be flashing the BIOS (obviously its most dangerous time) or while the card is at its peak of booting from the BIOS (doubt that'd corrupt it though........)
my recommendation would b if TPU has ur cards bios in there database.. try downloading it & get some software (either a TPU article or a google seach will find enough info) to flash it 2 ur card...
i cant guarantee that this is the problem.. but if it were me.. these are steps i'd probably take...
or u can wait for some other suggestions...
Don't forget to thank those who help you!
Please help package these 64 bit drivers.