Erratic Synaptic touch pad

[Riddle_Decipher]

@ndfar

Thank you for joining HP Forums. 
I'll be glad to help you 🙂

As I understand the touch pad has an erratic movement,,
don't worry as I will be able to help you out, although, I will need a few details to provide an accurate solution:

• Does this happen only with the browser such as Internet Explorer, Chrome (if yes, which browser are you using)?
• Have you made any recent updates to your computer, software or hardware related?
• When was the last time it worked fine (date)?

Check the Mouse options under control panel:

Start → Control Panel → Mouse → Buttons tab.
Check the box labeled "Use MS Office compatible scroll only."
Also, check the box below labeled "Scroll in active window only."

Attempt using an alternate/external mouse.

Uninstall and reinstall the drivers for your mouse:

Go to the Device Manager and select your mouse. Uninstall it and then restart your computer. During restart, your mouse driver will automatically be reinstalled.

• 1.   Click on Start and type ‘Device Manager’.
• 2.   Click Device Manager.
• 3.   Click + sign next to Mouse.
• 4.   Right-click on mouse entry and choose "uninstall".
• 5.   Restart your computer.

Keep me posted for further assistance.

If you wish to help others looking for the same solution as you've found, mark the post as Accepted Solution.
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And I Hope you have a good day, Ahead.
Regards,