Synaptics touchpad v7.2 left mouse click not working?

I have a toshiba satellite L645 and for awhile my mouse was working fine. Last month my left mouse button started working as the right one, and the right one kept working as usual, so now I have 2 buttons doing the same thing

.I HAVE gone into my mouse properties and switched around the primary and secondary clicking, but nothing changed....

I HAVE tried updating my mouse, but my computer said it was already updated.

My computer also says that it is working fine.

I really need some help here :(

....Okay so I just checked out the settings on my mouse and I change the let mouse click function to be: quick start, run program, automatic double click, and I tried a couple others. Then I did the same for the right mouse click. I got the correct results for all functions, except for the primary mouse (single click/drag) function, so I know that IS what's not working correctly.

Could anyone tell me how to fix this? Do I have to re-install the driver? Help :( Please?