I'm not exactly sure what you are asking. But, if you want to run Windows 7 and not windows Vista, boot through the drive where you have disk and install windows as an upgrade. If you can't get that to work, as a last resort, you can move your data to a backup drive, then do a clean install (which would mean wiping your current drive and installing brand new). And then move your data back to the drive after the install is done.