so i recently built a pc that i love (FX-8350, carbide series spec-2, AsRock 990FX KILLER, corsair CX750M, EVGA GTX770 SC 4GB, WD Black 1TB), i have the front 2 USB 3.0 headers plugged in and when i put a usb 2.0 cord or thumbdrive in them, my pc will freeze (win 7). there are usb 3.0 legacy...