Well, I just bought Splinter Cell. I installed it and played for a little while. The game ran fine. I quit playing for awhile (exited the game an all that). The next time I played, all character movement in the game was super slow. Everything else moves fine: the camera, the menus, etc. I uninstalled it and reinstalled it. Same thing happened. When I played right after, the game worked fine. Once I quit and played again later, it moved really slowly again.
Any ideas as to what could be wrong?

Which version?
Try setting AlternateTimer in one of the .ini's to the other value, or use some program for multicore/processor systems.

Actually, I was able to fix it by disabling the program from using both processors. Thanks though!