Does this gfx card require a power cable to be attached to it? look for an open gap on the gfx card itself where one of the PCI-Express PSU connecters would fit in.
Are you getting Blue screens of death when the errors appear?
Try cleaning the conenctions on the gfx card with a pencil eraser to remove any finger prints.
Serunson
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Did the gfx card come with a Disc that had some drivers on it? If it did revert back to these original drivers after totally removing the ones you have at the moment. It may solve your problems.
Serunson
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It quite possibly could be a start up issue with the BIOS. Also it could be a virus, spyware causing this havoc. What antivirus do you run?
Serunson
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So this problem occured when you originally built the PC? That would point to something that you didn't do right. I am not a pro when talking about BIOS, but i think it something that you put on a CD or a floppy disk (:D) and instal manually. Although i am unsure.
Serunson
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