After uninstalling the drivers for my XFX 9800GT I put in a Powercolor Radeon HD 4890. However, I see that there is an entry in my Start Menu called "NVIDIA Corporation -nv25665". It says that it's NVIDIA PhysX Properties and it's location is C:\Windows\system32. I'm sure I uninstalled all the drivers. What should I do? Clicking on it says that the file does not exist.