Ok there are a few options available to fix your problem.
1. Go into your Novalogic\Landwarrior folder. Open the cache folder and delete everything in it. Empty the recycle bin and try the game again.
2. Open your Land Warrior folder as before and try running the iswap.bat file (don't know why but when I had that problem it seemed to fix it).
Of course those options are assuming that you've installed and updated the game properly.
If all else fails, re-install.
Hope this helps.
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