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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.
if you have an older graphic card swap it out with the new or if u have onboard video use it as your video. Once you boot up uninstall the nvidia drivers and turn off pc. Now reinstall the new card and install the drivers from the CD or the new ones from the nvidia site. Dont use the windows device manager.
Did you install the motherboard drivers when you reinstalled the operating system? This is the only thing that I can think of that may need doing from your description (you didn't mention doing this).
If not, try doing that. If you don't have your disk, try a Google search with the following string:
(Brand Name) (Model Number) +driver
This should bring up some sites that list your motherboard drivers.
Another way would be to use Windows Update and choose Custom (instead of Express) Install and select all the Drivers and Optional elements (as well as any Priority elements).
I think I have already asked this - Is there only 1 Video Adapter listed in Device Manager? If not, Disable the one that you don't want to use.
As regards viruses, I recommend using AVG Free - it is a good antivirus program that updates Definitions daily - and best of all, it is free! You will still need to do a full System scan at least once a month to catch any viruses that slipped through before the Definitions were updated though (same as for any antivirus program).
The only time that this can happen is if the driver is not installed correctly, as on install you are normally asked if you want to activate support for dual monitors, so if you havent already, uninstall the card driver, restart and install driver again from the cd or from the NVIDIA website.
If you have already tried this my apologies.
Have you had a look at the cords? Is there any damage to the hardware itself?
Maybe there is something else wrong. Tried running virus scans? I know it's a long shot but it's amazing at what viruses do to your machine.