You probably could get away with uninstalling the driver, but I would try a few other things first.

Go to C:\Program Files\Sony\Setting Utility Series
Run VCCPointingDevice.exe
Untick the "Enable" checkbox and voila!
Tried that?

For me, I can go to Control panel > Hardware and sound > Mouse and there's a tab there where I can disable it, but that's brand specific. Check if you have anything similar, though! (if the above doesn't do it)