Prova questo:
http://answers.microsoft.com/en-us/w...6-0a0584aed1a5
Edit: prova magari anche questo:
Look for the following files on the GEARS DVD:
FirewallInstallHelper.dll
GameuxInstallHelper.dll
setuphelper.dll
EULA.dll
...and copy them to \Windows\system32\
This should resolve your (un)install problem.