I cannot open project structure in Android studio any more. `ctrl`+`shift`+`alt`+`s` and file -> project structure both are not working. When I try either of these, nothing happens! 

I am on Windows 8.1 and have tried deleting the `.AndroidStudio` folder from the Users folder. It resets everything but it didn't help.

I also tried File Invalidate/Restart -> didn't work :-(

Uninstalling and Reinstalling didn't work either. Any help would be really appreciated.