ok, this might be getting redundant, but just so i know that we are on the same page....go to control panel>printer & other hardware>mouse. under these properties somewhere, it should say
Left Button : Click (default)
Right Button : Right Click (default)
Uncheck anything that may say Enable program specific settings. If this doesn't work than I'm lost, it should. Do you have any programs installed that may impose macros onto your mouse settings?