.............when i click 'run as administrator' it does nothing.
It's usually a rogue third-party context-menu provider that's the culprit.
If you don't have any suitable tools of your own then download, unzip then run the portable version of CCleaner. Next, click on Tools -> Startup -> "Context Menu" tab. Disable an item in the list then test the right-click "Run as Administrator" option. Repeat until you find the one responsible for your problem.