I did get to install the game but everytime I double click on the icon for the game on my desktop I get this. I already tried to reinstall the game but still doesn't work. Also I have used compatability mode and selected to run like Windows XP SP3 but still doesn't make any difference.
This is the error message I get.
C:\Program Files (X86)\Unreal Tournament 3 Demo\Binaries\UT3Demo.exe: Modified executable code is not allowed. Please reinstall the game.
I know that on a different computer that has Windows XP Home it works fine but I don't know if that's the reason.