Re-select the standard Windows 7 theme (or any other Aero theme).Right-click the desktop, select Personalize.The strange thing is you can get Aero by doing the following: In the case of this particular issue both of these methods will not solve the problem and simply report that ‘ DWM not running‘ or ‘ Desktop Window Manager is disabled‘ and the system will still not enable Aero. Re-running the Desktop Window Manager (DWM) WinSAT test (either through the standard interface or by running ‘winsat dwm’ from the command line).
There are two main tools that people turn to when troubleshooting Aero: So here is a post describing the sort of symptoms you might see and how to workaround it. I saw this numerous times in early workshops and pilots for customers and completely forgot about it until I saw the question asked again a few weeks ago. An issue I saw a number of times at customers was that the Windows 7 Aero theme was not enabled after deployment.