as part of a recent windows update, the irritating and intrusive intellipoint microsoft mouse software now seems to have been replaced by the even more irritating and intrusive "microsoft mouse and keyboard center[sic]"

I am left handed and need to switch the left and right mouse buttons round. the option to do this has disappeared from the mouse control panel, to be replaced by a link which opens up said mouse and keyboard center. this in turn is a window which allows me to change settings on the keyboard but does not have any way to control mouse settings

any hints would be very welcome. this is driving me nuts.