I currently have two hard drives. My OS is in drive C (hard drive 1) and my backup drive is D (hard drive 2).
I want to do a clean install of Windows 7 and swap them, making my backup drive (250 GB) be the drive with the OS. Since it is currently drive D, I want to change it to drive C, and the previous drive C with the OS to drive D. Unfortunately, I can't change the drive letter of the active partition. It says that the parameter is invalid. Can you guys help me out?