From what you are telling us about the age of the computer, a new Cmos battery should be considered as long as you are in there.

I was discussing Windows 7 vs. windows 10 with a friend today and his comment was that despite Microsoft's statement that Windows 10 is the final program, to be infinitely updated, don't count on it. New programs are how companies generate income. As the revenue stream from windows 10 dries up expect another new program, at least in name.

2020 may or may not be the end of support for 7 but there will be more operating systems to buy.