Here is one solution if are running Aero Theme, but still you receive this message: “DWM composition is not running. Please switch to an Aero”.
To reach this Services menu, you have to do that - Control Panel → Administrative Tools → Services.
“Desktop Window Manager Session Manager” has to be under Status - Started, and Startup Type - Automatic
More information you would find on the link above.
I hope it would be useful!