I about to install a new motheerboard and cpu. Im going to an athlon II X4 640 and an asus motherboard. Its going in my current computer that is running on Windows Vista. The new motherboard and cpu will change my bios from 2.3 to 2.5 version. I want to leave the current Window in untill the installing of mobo and cpu is done. Im hearing that i may have a problem with the Window accepting new components, is this true ? I cant just update the new version of bios, or will i have problem and have to reinstall the window with a new key ? Everything else is staying the same only mobo & cpu is being upgraded.