Unreal Tournament 3 Demo error

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.
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