Video appears choppy when playing back files

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http://www.linuxforums.org – Hey all, Sorry to be a pain yet again, but I'm really keen to learn more about Linux and get my system up and running perfectly. I have a Dell Inspiron 530 with an Intel Core Duo 2, 3GBs of RAM, a 512MB nVidia graphics card and a 500GB hard disk drive running Mandriva Free 2010 64-bit, however, I've noticed that video playback often appears choppy. This isn't just limited to video playback but also tasks like dragging a window around my screen, whereas none of this occurred when I was running Vista. What can I do to fix it? Is it as simple as installing a correct driver or something like that? Could this be because I'm running the free (or One) version which supposedly just uses generic drivers? If yes, can I upgrade to the PowerPack without losing any of my settings and files? A HUGE thanks in advance. Stu :) (HowTos)