Stop Service
net stop uxsms
Start Service
net start uxsms
Disable Service
sc config uxsms start= disabled
Enable Service
sc config uxsms start= auto
Desktop Window Manager (dwm.exe) is the compositing window manager that gives you all those pretty effects in Windows Vista: Transparent windows, live taskbar thumbnails (that you can resize now), and even the Flip3D switcher that you can disable and replace with Switcher.