Windows 7 Home Premium on 300Gb SATA hard drive. Was working fine but now will only boot in Safe Mode and can even do a system restore but on full boot hangs at the Windows Logo starting screen. When trying a system repair using the original W7 CD it can't find a windows installation! Any ideas please? Also on the screen when it says Load Drivers I can access the C: drive but I've no idea where the SATA drivers would be located.