You surely did not try to install Windows onto a drive, which was connected to a computer that already had a hard drive in it with another Windows install already on it, did you? If you did, it will create all sorts of problems. You need to unhook all other drives except the drive that you are installing Windows on, then do the install. Likewise, you cannot do the install on one computer, and then change the drive to another computer. The install must be done on the computer the drive will stay in.