I just installed water cooling on my PC and used the AMD catalyst control centre to test the speed limits. It got to 4.5GHz then crashed. Then came up the blue screen of death. When my computer eventually turned on it was on W7 Basic and it won't let me change it. I've tried uninstalling and updationg all my drives, re running the windows experience index, i've even tried switching around some of the plugs on my motherboard... and still nothing!!!!!!!!