Did you make sure to set the current theme back to default before uninstalling? Since AG is gone the system won't accept the custom theme, resulting in a black screen. If that's the case then you can use any rescue disc to access registry, navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ThemeManager and set the DllName back to its default value, which is "%SystemRoot%\resources\themes\Aero\Aero.msstyles" (no quote), reboot and voilà. Thanks, but did not help. Theme default, dllname default, AG uninstall, Win not starrted. Maybe because by an reg key from older version? I see few key after uninstall, but i don't know which is win-key in dwm section.