I have the same problem... get a "double click" response when i single click.. checked folder setting to verify double click to open was set correctly, d'loaded latest intellimouse software from microsoft, uninstal old software, re-install new software, reboot, no help. Reboot into 2 different XP configurations, on same system, mouse works without a problem. Obviosly a mouse
driver problem, lol a microsoft mouse that doesn't work with a microsoft OS...<sigh> what to do, what to do....