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You don't disable it from there. Reenable it again and do it right: you uninstall its drivers from Programs and you reboot twice; you install the new card and you connect the monitor to it; when the pc starts you go directly in the BIOS and you disable the onboard card from there; you reboot one more time and you install the drivers for the new card.
http://www.evga.com/support/drivers/ Download the drivers you need, and install them manually in the Device Manager.
In Windows 7, goto the Device Manager (click on Start, right click on My Computer, left click on Properties, click on Device Manager) Look for your video cards, click on the + to see which ones are installed.
Once you have the new drivers installed, you may have to uninstall the integrated graphics drivers to force Window to use the new card.
Before tring to install Windows 7 I suggest you download (or your in law) from Microsoft a utility program that detects your hardware and tells you whether the system will support this RC version of Windows. Download "Windows6.0-KB947821-v4-x86 Update Readiness.msi" and run it on the system prior to installation. If your system is already damaged, install a base WinXP OS on it and try it. Good luck!
Had a similar problem with P5ne-sli motherboard, Intel Q6600 cpu, Nvidia GTS 8800 video card. One day the ethernet just stopped working, but it was working... It would connect to my network but would see "limited or no connectivity" in the taskbar. Went into BIOS and looked at the signals and for some reason only 4 of the 8 signals were getting a reading. Figured a power spike had fried my onboasrd ethenet card. Switched to an old PCI ethernet card... after two years I was doing a fresh install, of XP and for shits and giggles I just plugged the ethernet cord into the onboard with the PCI ethernet card removed. When windows went to validate it detected and installed my onboard ethernet...validated then proceeded to update windows. Over a year later it still works. Never bothered to update BIOS until last month and that was only to fix the long boot time with ATI 5770 video card. Willing to bet that resetting your BIOS will fix the problem for you. Just unplug computer, remove battery, attempt power up to clear any juice still in the system. Replace battery and boot up computer... Also removed a DIMM that went bad around the same time. May have been a factor so try testing your RAM.