@Zahran234
Thank you for joining HP Forums.
I'll be glad to help you.
As I understand your laptop continuously scrolls down,
No worries, as I'll be glad to help you, that said, I'll need a few more details to dissect your concern & provide an accurate solution:
Did you check if the touchpad is stuck? have you disabled the touchpad and check if the scrolling continues?
Have you attempted to try with an alternate mouse to check if that works?
If you haven't, Please attempt using an alternate/external mouse.
(If that works when the touchpad is disabled on Synaptic software, it would mean that it's a touchpad failure,
However, if the external mouse doesn't work either, it could be a software/driver issue).
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.
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1. Click on Start and type ‘Device Manager’.
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2. Click Device Manager.
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3. Click + sign next to Mouse.
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4. Right-click on mouse entry and choose "uninstall".
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5. Restart your computer.
Let me know how that pans out
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followed by clicking on 'Accepted as Solution' as it would help the community gain more knowledge,
And Have a great day Ahead!