Hi, so I'm getting a new CPU and motherboard (i5 2500k and ASRock Z77 Extreme4 LGA 1155 Intel Z77) but I dont have a Windows cd to re-install the OS when I change motherboards, so I'm trying the usb flashdrive method. I have a 4gb usb stick and I put the Windows 7 files onto it, but when I go into the bios setting for the motherboard I dont have the option to choose the usb stick as boot up to install the OS. But when I go into primary harddrives or w/e right under the primary boot options I can select between my HDD and usb stick as HDD 1 or 2? And if I switch the usb stick as HDD #1 I can change my boot to it, but when I start the computer after doing that it tells me it doesnt detect an OS.