Hot to turn off the application compatibility engine in Windows 7

 To turn off the application compatibility engine you need to:

1. Run GPEdit.msc
2. This should open the Local Group Policy Editor
3. In the tree (on the left) select Local Computer Policy then Computer Configuration,Administrative Templates, Windows Components and finally Application Compatibility
4. Locate the entry for Turn off Application Compatibility Engine and double click on it
5. Select the Enabled radio button and then click OK
6. Next locate the entry for Turn off Program Compatibility Assistant and double click on it
7. Select the Enabled radio button and then click OK

You should now have something that looks like this:

Now you will need to reboot your computer (forcing a group policy update is not enough in this case).