This has nothing to do with 'buying the game':
Known graphics issues in Fable: The Lost Chapters
Issue 3: Runtime error
When you start the game on a computer that has GeForce2 MX 400, GeForce4 MX 420, GeForce4 MX 440, GeForce4 MX 440SE, GeForce4 MX 4000, GeForce4 MX 4400, or GeForce MX 460, you may receive a Microsoft Visual C++ Runtime Library error message that is similar to the following:
Runtime Error! C:\Program Files\Microsoft Games\Fable - The Lost Chapters\Fable.exe
This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. These video cards are not supported.
To resolve this issue, upgrade to a video card or a chipset that has support for Pixel and Vertex shaders. For a list of unsupported video cards, click the following article number to view the article in the Microsoft Knowledge Base:
905588 (
http://support.microsoft.com/kb/905588/) The minimum system requirements for Microsoft Fable: The Lost Chapters
http://support.microsoft.com/kb/905587
You will have to upgrade your video card to meet the system requirements.