[Margaret Pilkington]

A system restore takes you computer back to a previous date.
A time before the changes your son made....which seen to have made your machine haywire.
I am not sure how you do this on a windows 10 operating system.....but I can tell you how it is on Windows 7.
I go into the control panel.....I choose Recovery...this brings up a page which tells about a system restore(it will not change any of your files, documents or pictures) it just removes recently installed programs which might account for your problems).
On this page there is a click box to open the system restore.
I will post a couple od screen shots to help clarify what I mean.

If you cannot do this maybe your neighbour could help you, but I would strongly recommend that you sit and watch what she does.... And perhaps get her to show you.
I can remember a time when I was like you..... But I have learned a lot.....and it does pay to learn a bit about how to do things.
I hope you get sorted out very soon.