Microsoft Flight Simulator X has the Robinson R22 Beta II included:
http://www.microsoft.com/games/fligh...t_aircraft.htm
I used it once or twice in my notebook with the X52 when I was a student pilot:
http://astore.amazon.com/hovercontro...581808-8600636
Here is a great page about simulation:
http://www.hovercontrol.com/docs/get...c_page30.shtml
(see the links on the left side, ie. Starting from Scratch)
Hope that helps.