On my laptop I have Win7 Home Premium. When ever I go to install SP1 my computer BSOD on the "Starting Windows" screen. When I roll back to pre-SP1 it works fine. I tried installing the individual parts seperately but doesnt work either. I think maybe the Win7 currently installed is corrupt somehow. I do not have a Win7 Home Premium disc. I only have the Win7 Pro 64-bit upgrade disc that is installed on my main rig. Is there a way I can re-install Win7 Home on my laptop with out a physical copy? I do have the serial key. I once read that you could install anyversion of windows with any disc. The version activated was based on serial number entered. Any help would be nice.