what is ur driver version now?? Mine's 16.2.10.12
When i first installed win 8 here, it automatically installed some synaptics driver and then later i downloaded the latest driver from hp site and installed by over-writing the present one i had. May be i shud clean install it again by completely removing whole of the driver's traces.
Dude the touchpad works fine when there's no sweat over it.. or else it sits there n doesn't move like it should..