Re: Reinstalling Windows Help!!!
Boot from the Ubuntu CD but run in LiveCD mode.
Open the Partition Editor. IF any partitions are mounted, unmount them.
Remove ALL of the partitions. Remove the Ubuntu CD.
Insert the Win7 DVD (if this IS a DVD, then it's most probably an Installation DVD). Since the drive has no partitions, you should then be able to install.
However ... if this is a CD (not a DVD), then it's most likely a Recovery Disk, and without a partition on the drive containing a Win7 Image file, you're not going to be able to get win7 back -- since this is NOT an installation DVD.
Ubuntu 16.04 Mate, Mint 18 Mate; MS Win 8.1, MS Win10 Pro.
Will not respond to PM requests for support -- use the forums.