I am having trouble with an old Acer Aspire Desktop. It is running Windows 98. It has an onboard 2MB ATI Mach 64 video card. I installed a Nvidia TNT2 16MB PCI graphic card in the first PCI slot. When I turn on the machine the new card is not found by Windows. The onboard video card still works for awhile, but it freezes up after a little while. I have tried running Add New Hardware via the control panel, but the new video card is not found. Any guidance would be appreciated. If I take the PCI graphic card out and re-boot the onboard card works fine.