Did you install GTL correctly?:
1. Install GTL from the DVD - Attention! Don't start the game yet.
2. Install Update V.1.1.0.0 .
3. Install Python, Wxpython and the Autoupdater (to be found at altbierbude.de -> downloads -> miscelleanous)
4. Run the GTL noCD Patch (Autoupdater->Tweaks) - this may take some time since about 170 MB must be downloaded.
5. Start the Autoupdater to install new cars and tracks. Again, you have to be patient because the updater currently has to download about 20 GB.
6. When it is finished click on 'Tweaks / Unlock all cars / Create TG2001.DYN . You can also set the car price e.g. at 1 (but not 0!).
7. Start GTL, create a new profil and you're ready to race.
(Taken from the German
FAQ, section Installation.)
Darth Maul