How i can alterate the Antialiasing Rate in C++?

I don't know.

However, Inoticed that if I set my graphics card default to perform anti-aliasing, it actually works in my game! I had no idea you could do this until yesterday. Anyway, can this be turned on in c-script?

One of the options in the graphics card dialogue is to set antialiasing to "application controled", there must, therefor, be a way to turn it on through game studio, right?

To change the multisampling in C++ do this:
define a D3DPRESENT_PARAMETERS struct and call
device9->reset(pNewPresentParameters);

Is there any way to do it in C-Script?