Try this, Press command+tab together which should open the finder, Then press command+N to which should open your home folder
Next press command+2 which will select list mode and use the right and the down cursor keys to go to Preferences in the Library folder
Look for the com.apple.driver.AppleHIDMouse.plist file and use your cursors to highlight it and then press command+delete to remove it.
Next press command+control+eject to force your mac to reboot and when the machine comes back up your mouse should be back to default.
Let us know if that does not work.
Problem. When I press command-tab I get three options: Finder, my game (Bejeweled), and Yahoo Messenger (which I have set to open when I start up). So holding the command button I can then use the tab key to scroll between these options. Once I have Finder highlighted I don't know how to open it. Just letting go of the keys does nothing, hitting enter doesn't work, etc. Can you help me get Finder open? Thanks,