I reinstalled FS9 and everything seems to be working fine. However, I have two problems:
On takeoff, when I release the brakes and give it throttle, the aircraft (doesn't matter which one I am flying - they all do it) immediately begins its takeoff run by making about a 45-degree left turn. It will not go straight ahead, down the runway and take off.
(I have encountered this problem before in previous versions of FS and used to know how to fix it - but I seem to have forgotten the solution. I think it has something to do with the joystick sensitivity settings (null zone). I tried reducing the null zone for the rudder to zero, but that had no effect.)
Second problem: Whenever I press the Y key to enter into the slew mode, the plane immediately begins backing up at a high rate of speed. If I let it go long enough, it will actually take off in reverse, gradually gaining altitude - a perfect takeoff, but at very high speed and in reverse.
(With regard to this problem, I think I just may have something "on" that shouldn't be on - but I have no idea what it is. Or, that may not be the cause of the problem at all; I don't know - that's why I am putting the question up here.)
These are both rather basic questions, and I have been a flight sim enthusiast long enough so that I should know the solutions - but I don't, sad to say.
Any suggestions or help would be much appreciated.