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#11
You probably don't have to reboot. You can use the old "Explorer Reload Trick".
Make sure you start a command prompt first.
Then, hold down Ctrl-Shift and right click on All Programs in the start menu, you get a new option "Exit Explorer" This shuts down your shell. Then, in your Command Prompt type "Explorer" and it will start up again.
If you don't open the command prompt, you won't have a way to open a new explorer. You can try using Task Manager if you can get to it.. but if you're using remote desktop or an enhanced Hyper-V session, that can be tricky.