Re: I want out!
Hello and welcome to the forums.
I am sorry the upgrade went bad for you. To format the hard drive and reinstall Windows you will first need to create a LiveCD or USB. You can boot the LiveCD in the Try Ubuntu Without Installing selection, then open the menus to System> Administration> Partition Editor or GParted. Using the partition editor/gparted you can delete your current partition, then create an NTFS partition so that Windows can see and install to the hard drive.
Cheers & Beers,
Ubuntu 14.04 is the Ubuntu I've always wanted!