I wanted to install Windows 7 on another HDD so I plugged it into my computer, and unplugged the other HDD's. After starting installation there were errors, so I cleaned my flashdrive and put the CD back onto it (with WinToFlash). There were errors again, so I just quit. I unplugged the HDD and plugged the others back in. It said something about BOOTMGR is missing. I made sure the flashdrive wasn't plugged in.The only way to get past the error was to plug the flashdrive back in. So I am just trying to get back to my normal Hard drive with an OS.