Will mercury mother board (pvm7pro 1.0) supports...

Question

I had mercury motherboard and the model was pvm 7 pro v1.0... I had nvidia AGP 8x card (256 mb).  After connecting that graphic card to my system.  i am not able to reboot using XP or vista.  It shows that "the window is loading files" only.  Give me a solution.

My system configuration was
Mercury Mothe Board pvm 7 pro v 1.0
Intel Celeron D processor 3.06 ghz
1.25 gb ram
DVD writer
etc