Windows 10 (x64) won't load to the login screen with a PCIe USB 3.0 expansion card installed. It either hangs at the blue Windows logo screen or shuts down with a "PC error" message. I get the same results with two different (new) USB 3.0 cards in either of the two available PCIe x16 slots (ASUS M4A79 mb). I doubt both brand new cards are defective.)