Yeah my vista runs at about 1.44 which is about half but I think mine is pretty reason considering I'm running veoh and instructables. (Both memory heavy websites). Im also using two other tabs have winrar open, google desktop. and 84 total processes.

I would try disabling some of your visual effects. You can also try shutting the computer all the way to dump ram, and then turning it back on. My ram starts to fill on my laptop after taking it in and out of hibernation without eve shutting it off.