Sin Gold starts up and runs fine for me, all the way through the first helicopter segment. But as soon as I'm walking on the ground, there's a problem: I keep moving backwards (backpedaling) without pressing the key I've assigned to it.
I'm running it on Windows 7 x64 with an intel i5 and an nVidia 660ti. If you would like to know any other specs, let me know.

Thank you for any help.

Hi

Have you tried most common solution-ReInstall/Uninstall.

Thank you.

I seem to recall this is a joystick issue. Probably something you can disable in the game settings.

I had a similar issue, except that instead of backpedalling, I was stuck crouching. Curiously, pressing the crouch button made me stand up. Anyway, I saved the game, quit the game, and reloaded the game, and then I was standing upright and had no problems. The game does something weird when you first start it. It changed some of my movement bindings too!

I don't know if this helps, but it's worth a try, in case somebody else runs into this.