Quite possibly because you upgraded with the patch. Cheats depend on memory locations as do trainers, and while I have found many cheats still work even after upgrading patches, some do not. I haven't gotten the 1.0 version of the cheats to work this time around though. They did last time I had the game on the computer several months back but, I'm doing something wrong this time around which I haven't figured out yet. A suggestion is, if you don't especially need the patch and it isn't any great shakes in features, uninstall the patch or uninstall and reinstall the game and go back to the original retail version.