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To perform a Hard Reset, unplug the AC power adapter and remove the
battery, and then press and hold down the Power
button for about 6 seconds. This will drain any residual charge in
the capacitors and reset the power management controls to their default
If it is on your touch pad it will be indicated with a small vertical bar, on the right hand side. Slide along that to scroll.
If it doesn't work, then the laptop doesnt have one, and you'll have to use the scroll bar at the side of a web page. (double tap but keep hold on the second tap, this indicates holding down a click) then move up or down as required.
Try contacting hp through their live chat and aqsk them how to reinstall the mousepad driver. if they cant help try restoring your computer to a date before the problem started or reset the operating system.
have you recently loaded any new hardware or software to the system. if so... this may be the source of the problem. you would want to load in safe mode and remove whatever you changed. that would then fix the problem. i wouldn't jump to the conclusion that your operating system is corrupt just yet. it sounds as though it is doing exactly what it should when it comes upon a conflict in the system.