X64 Does Not Detect XFX GeForce 9500 GPU

GPU: XFX GeForce 9500

Gateway LX-6200

Computer Specs:

Windows Vista Home Premium x64

AMD Phenom 9500 Quad Core

8GB Ram

Serial ATA 500GB HD

ATI Radeon HD 3200

500W PSU

(any other info needed, just request)

P.S. Not sure of the MoBo build. It was the original MoBo that came with the computer.

I originally did what I normally do when installing any graphics card; I uninstalled the on-board graphics card drivers and disabled it, then attempted to install the drivers for the new card. While running the installation, an error appeared telling me that it didn't detect any Nvidia compatible hardware in my setup. So I checked my device manager and sure enough, there was only the onboard card showing up in the list. So I tried restarting the computer to see if a reboot would cause it to appear. Nothing happened, so I ran CCleaner and Driver Sweeper to clear any registry and drivers issues that could be occuring. I rebooted, and still nothing appeared. So I went into the BIOS and tried to change some settings in there. I disabled the on-board through the options there, but that only caused the BIOS to give me issues and I couldn't even reach the splash screen, so I reset it and then tried changing the load settings from IGFX-GFXO-GPP-PCI to GFXO-GPP-IGFX-PCI, saved and then rebooted. I got past the splash screen on the new video card but the computer locked up before it would load the OS. So I know that both the card and the PCI-E slot on the MoBo are working fine. But I have run out of ideas as to what to try next to get this to work.