Windows 10: Scroll bar not working properly

Scroll bar not working. cursor flying all over the screen. Tapping on the pad and got no reaction. Icon freezes pad and I must hit escape and start again. Steps to resolve please and thank you!

:)

 

TPU review scroll bar

I was wondering if there was any specific reason the buttons to scroll down the list of reviews was stuck in the bottom left-hand corner? Whenever I want to read reviews, I always have to move my cursor and aim it at a small arrow that scrolls the reviews... I'd suggest that instead of making the arrows small and in a corner, it would be better placed to the sides of the review bar.

Something like this (yes, I know it's crappy but it took 5min to make):

 

Scroll bar keeps jumping to top of scroll bar

Hi,

There are several factors why you are experiencing this issue and that's what we are going to find out. Before we proceed, may we know the following:

• Any changes made on the computer prior to this concern?
• What troubleshooting steps have you tried so far?
• Are you experiencing this issue on all scroll bars available on your computer?
• Can you send us a screenshot with what you are experiencing when using the scroll bar?
  Note: Please do not include any personal information.

 

Scroll bar on main menu scrolls straight to last item

When I click on the scroll bar of the main windows menu (bottom left button) and start to scroll down, the scrolling then continues automatically to the last item on the list so that I can't access the others. It is as if gravity has taken charge! There is no problem with scroll bars in web windows or in Excel. I think the same problem was happening in Word last week but it is not today. I have tried following various recommended fixes including a clean boot, running Windows defender scan and switching off some mouse functions. I am no computer expert so it is possible I have perforemd all these actions correctly. Nothing has solved the problem. I've also tried a different mouse.
Any suggestions as to what is the cause of the problem and how I might fix it would be very much appreciated. The graphics card is fairly ancient: could this be the problem?