Could there be some leftovers from a previous - modded - installation? You may want to get a registry cleaner - CCleaner from Piriform is a very useful tool and freeware. Uninstall the game via Control Panel - Run the CCleaner - Reinstall (not into the default path!) - Don't install any other stuff - no 4GB patch - no NoDVDfiles (no need anyway I guess)... - Start the game once. - Try to install GWX - Post the exact message if still necessary
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