Download and install GLDirect. It makes OpenGL games use DirectX instead. You may need to download DirectX 9. Don't worry, it won't mess with any of your Direct X 10 stuff. Make sure that GLDirect has rendering set to your Video card rather than software rendering. Here is the link. ftp://ftp.scitechsoft.com/gld After install, click the free-gldirect-code.txt. The product used to be shareware, now they have released it for free. Got Jedi Academy running on Vista with this.