I'm not familiar with the 5300 Y but I do have a machine here with on board video that I am using an GeForce 8600GT card on.
My main question is...Is the video card an AGP card or PCI-express?
The GeForce 8600GT that I have is made for a PCIe slot.
I believe there is an issue with finding proper drivers for the AGP version.
If it is an AGP card (which makes sense for a Presario 5300 series PC) then we'll check the BIOS settings for the AGP slot and try to help you find a proper driver (looks like that may be a problem).
It may also be a counterfeit card and I'll look into that for you.
If it is PCIe (which does not makes sense for a Presario 5300 series PC
) then we'll make sure it is plugged in right and is actually compatible and then check the BIOS settings .
If you can't tell, take a picture for us or let us know and we can try to find a picture for you.