Argh, I'm afraid I'm having problems with GF as well...any help will be greatly appreciated.
I'm running Windows XP, and I've satisfied all the technical requirements. I've also got DirectX 9.0, which may be the problem.
I've downloaded the patch, and when I troubleshoot, I get some exclamation marks telling me files are old or missing, and to reinstall DirectX. Even when I do, the exclamation marks don't go away.
My problem is that the game will freeze up for no apparent reason, or the sound and music will disappear.
I'm not very technically literate, so I can't "downgrade" DirectX, nor do I know how to disable my computer's Hyper Threading technology.
I'll be grateful for any advice.