Has Windows ever fixed the timer. For example, I am copying or moving
some files. It can say 1 hour left, then a few seconds later it will say
3 minutes left. This happens in all Windows functions, when Defragging,
when copying or moving, and many other functions.

This occurred in Windows 98, 2000, and XP. I have not yet noticed it in
Win7, but I just began using 7. I DO NOT have Win 8 or 10.