Is this a P7P55D? If so according to ASUS that second PCIe slot is only a PCI Express 2.0 x16 slots (@x4 mode, 2.5GT/s). I'd put the card back in the first slot. Standard VGA Adapter is what is displayed when the system doesn't know what the card is and the official drivers
are not installed. It indicates that Windows is using the standard generic basic built in drivers. What drivers have you tried and where did you download them from?