Mouse problems in Q3 with win2k

[Slacker]

Everything was great, until I installed the point release (1.27g) after that the mouse went nuts, the smallest movements would spin me around in circles, so I uninstalled Q3 and re-installed it as well as the 1.17 point release but now when I am moving forward (using the left mouse button) if I fire (using the right mouse button) I am stopped and have to lift my finger off the button and press it again to move, if I fire again, I stop moving again, help