xIsaac2011, you don't need to uninstall Linux Mint to be able to install Windows 7. Windows 7 doesn't care that you have a Linux operating system already installed; it will just overwrite Linux Mint during installation. If you have problems getting Windows 7 to install, that's a problem with the Windows 7 installation and has nothing to do with Linux Mint being installed (again, Windows 7 doesn't care and will just overwrite Linux Mint during installation), so kindly suggest--like others here--to visit a Windows 7 support forum to get help from users that have experience with installing Windows 7. However much we want to help you, we aren't Windows 7 installation experts
If you bought windows 7 recently, it may be worth to check what kind of support from Microsoft you are entitled to (like free phone support perhaps).