There has been no mention of the specific computer hardware involved, either, and that can be critically important.
I have a Dell Inspiron 1720 laptop that I bailed on Windows 10 simply because no compatible driver could be found for the ALPS Electric mousepad and using an external mouse, no matter the driver, resulted in behavior as described so far in this thread.
Not that I can be certain that it applies here, but it can be said with certainty that some older hardware will not be compatible with Windows 10. Some have had luck in eventually finding drivers that work, others have not.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story