The following snip is from the evga site, 500 series, win 7 x64 drivers Attachment 232114
download the latest correct driver.
Do NOT install at this time.
once again, put the jumper to the onboard graphics.
Use Device Management, (devmgmt.msc) and disable, then uninstall all of the drivers for your evga card.
shut back down,
reset the jumper to use your graphics card.
Do NOT install any drivers.
Does the card work correctly?
If no, then :
Install the driver you just downloaded.