Graphic card install hangs Vista after crcdisk.sys

I have:
HP Pavilion m8013w
Athlon 64 X2 4800+ 2.5Ghz
ASUS M2N68-LA motherboard
ONBOARD GeForce 6150se
4GB Ram
Windows Vista Home Premium SP1

I have tried to install graphics cards in PCI-E:
Radeon HD 2400
Radeon HD 4850

I get BSOD on startup of Vista; Safemode shows last driver installed is
crcdisk.sys, then it hangs at that in safemode, or black screen in normal.

I can remove the graphics card, and it will start up properly.

At first I thought it was my ineffectiveness at disabling the onboard Nvidea
card, but tech support for those cards insist that disabling/uninstalling it
in device manager, and switching primary video adaptor settings in BIOS from
onboard to pci-e should be sufficient.

Googling the crcdisk.sys BSOD reveals this was a common problem when vista
came out with "incompatible" hardware on a Vista upgrade from XP, and is
either a hardware conflict, or conflict between drivers, but I could not find
a common solution.

My generalized hunch is that something with vista and the onboard card
doesn't like the new graphics card.

Does anyone have any thoughts on this, or a solution?



.

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