I used to have a lot of problems with the touchpad intermittently freezing; it then worked well for a while but is now misbehaving oddly.
The right and left buttons on the touchpad work normally, but instead of moving the cursor, trying to use the main part of the touchpad scrolls the screen up and down instead. A USB mouse connected works normally.
It started yesterday. Only thing I did was run AdwCleaner and delete a registry key it found (I think I had downloaded adware on mistake so I was cleaning it). It started this behavior a little while later.
ScrollLock doesn't seem to be on and I have tried disabling and re-enabling the touchpad.