You'll need a Win7 Installer for your version with SP1 included (not slipstreamed) to do the Repair Install if you have SP1. If not, you'll have to uninstall SP1 or use a pre-SP1 installer: uninstall Windows 7 Service Pack 1 (SP1)
Have you tried to Repair WLE from the Programs and Features menu? If not have you tried installing a fresh download over itself to see if it works or will uninstall correctly? I suggest the same for the other programs having problems to see if it's limited to them.
Make sure no component of WLE is running in SysTray or checked in msconfig>Startup or msconfig>Services after hiding MS services (then reboot) - this will sometimes block uninstall.