I bought a new N-vidia G-force for my computer,
my problem is my computer shuts off after a while of running.

when i start my computer it picks up the new card and i can log on like
everything is fine. i log onto my account and then the plug and play detector
picks up the old onboard video card and then my computer rebots.
the screen then goes black.

I disable the card and turn it off in device manager however every time i
log on to any account it does the same thing picks up the old card and im
screwed,

my new card meets all the minumim requirements in order to run.

might anyone be able to help me