Re: can't install 11.04 version
If you are determined to continue with this, then BEFORE you do anything else, do yourself a favor and use the Backup feature in Win7 to create and burn a Win7 Repair CD.
That will prove invaluable later, should something go wrong during your dual-boot setup and you have to repair the Win7 boot loader, or you simply want to remove Ubuntu and restore your original Win7-based MBR.
Ubuntu 16.10 Mate, Mint 18 Mate; MS Win 8.1, MS Win10 Pro.
Will not respond to PM requests for support -- use the forums.