I too am experiencing the same and have a Dell Inspiron 1525 with Vista. Tried to disable the internal mouse and it only allows me to Uninstall. It was doing this skip thing before a recent crash and after everything was wiped off, cleaned up and some reloaded -it happens still. My computer guy put everything back on clean and installed new security software -so it is even more confusing.
We all have different software and different computer models - someone please help us!