Re: Upgrade problems...AHHH HELP!
Well since it BSODs on boot "sometimes" its a hardware problem. If you are overclocking, try it without. If your bios allows you to adjust your AGP and memory voltages try increasing them just a tad. Make sure you have proper airflow, and that the fan on the card is work etc. It may also be that your power supply doesn't have enough juice for your newer card.
Core2 Q9400 @ 3.0, eVGA GTX 260, 4G DDR 800, Vista64