Forcing Aero on Non-WDDM Compatible Cards

Have an older video card but want to play around with Aero?

WARNING: This tweak may cause a blue screen loop or constant flicker depending on your video card. Use with extreme caution, this tweak is really only here for documentary purposes only.

From the Start menu, click All Programs and then expand Accessories.
Right click on “Command Prompt” and click “Run as Administrator”.
Click on “Allow” from the Windows Security dialog.
In the Command Prompt window, type “regedit” (without the quotes) and press Enter.
Navigate to HKEY_CURRENT_USER\Software\Mic rosoft\Windows\DWM (if this key doesn’t exist, create it)
Create a new DWORD (32-bit value) of UseMachineCheck, and set its value to 0.