Tellos is right about FileMon. FYI, it's made by SysInternals, which was acquired by Microsoft somewhat recently. Their excellent products remain free, among them FileMon, and Process Explorer which is similar to Task Manager and probably what you meandered into.
I had a somewhat similar problem with KOTOR back when I had a faulty graphics card. Have you tried to upgrade your graphics driver to the latest available? Have you tried downgrading it to an older version (like, two years old) to compare?
I think you should first download FileMon and try it out, it might give a valuable clue. First try to filter away anything non-RTW, and if that doesn't tell us anything you can try to run it unfiltered (it will gobble up your memory pretty fast though).
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