I have an hdd that came pre installed with windows 7 64 bit. i recently purchased a sabertooth x79 (bios version 2104) mb and a intel i7 sandy bridge 3.2 ghz and tried to hook up my hdd to it. As it was a new mb, i had to reinstall windows, but as my windows did not come with a disk, i did it by restoring factory defaults. everthing seemed to go smoothly until windows 7 was booted and my keyboard and mouse decided to stop working. they work fine in bios and before i boot. but when windows 7 is booted they dont work. i tried 2 different keyboards and mice and in each usb slot. i also tried to boot in safe mode but it wont let me run the windows setup in that mode (and they dont respond there either). any idea what might be causing this or what i can do?