The only thing I found that worked was to reinstall Android Studio.
If you are having this issue, completely uninstall Android Studio (if installed) via control panel uninstall (or using uninstall software)
and
REMOVE the .AndroidStudioPreview folder in your C:\Users\ directory
Then go ahead and grab the latest release of Android Studio from http://tools.android.com/recent and use this.
It solved the problem for me when all else failed.