You might check if you have any of the windows keyboard accessibility options turned on. Start->Settings->Control Panel->Accessibility Options
So am I, so I'm actually a bit stuck with the same problem.. :sSo hang on, ` opens the console (as it does for me) and ' does as well?
►►►Troubleshooting FAQ - READ THIS FIRST"Some keys stop working in Vista / Windows 7" I tried that and it is still not working.Badspot needs a solution.