You might also have been able to restore it this way:
Open Task Manager, go to Processes, highlight 'explorer.exe' and click on End Process. Then, go back into Task Manager, and in File section, select New Task (Run). Type explorer.exe (or C:\Windows\explorer.exe) in the Run box (it may be there already). Below the command, it should say: This task will be run with Administrator privileges. Click Okay.