I just ran a cross this tip and decided to pass it along.
1 Disable UAC, If you have not done that See Here
3 Make sure that you are in an administrator account (otherwise this will not work.)
3 Click the Start button, type regedit into the Search box, then press Enter to launch the Registry Editor (regedit.exe).
4 Navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM
5 Change the values of the entry Composition to 1 and the value of CompositionPolicy to 0 (In some cases this will not work so change CompositionPolicy to 2)
6 Close Registry Editor.
7 That’s all, Reboot and Enjoy.
Note: The author of this tip mentioned that this might not work for you if are you have SP1 installed. So far he has not tried it with SP1 he knows it works pre SP1.