Please download and install the Tahoma font: http://download.microsoft.com/download/office97pro/fonts/1/w95/en-us/tahoma32.exe
Additionally we strongly recommend that you download the latest (DirectX) graphics driver for your video adapter. First uninstall the current graphics driver then install the newest one.
If the problem persists please send us the log file for the game you are playing. We need this file to be able to analyze your problem and help you since it contains information and error messages of the thriXXX software. The file can be accessed via the Windows Start Menu –> All Programs –> ThriXXX –> [GAME NAME] –> Open Log Folder.