I have a laptop with a broken hard drive. The drive is going to be replaced but I wanted to know if there was a way to reinstall Windows without ordering a recovery disc from HP. It came with Windows 7 Home Premium 64-bit. I found another thread which I can't link to (id is 33944), but it didn't really explain what it meant. Can I install Windows 7 on this machine with a retail Home Premium 64-bit disc? How does a COA key work? Is there anything special I have to do to activate Windows using a retail disc? Any help would be great.