Thank you for your post and your kind words. It is my pleasure to try and assist you with your computer issues.
This is totally your decision. I have "salvaged" computers in the past, but it can sometimes be a very long and drawn out process, depending on how much "corruption" there is present. Sometimes, it is just not possible to get a computer working satisfactorily. We might get it back operating at some level, or not at all, but weird issues will persist. And then again, sometimes we find the one program/process/hardware component that has been causing all of the grief. Fix that one tiny piece and things start humming.
The fastest route generally, but the most "painful", is a clean install of the OS, and then copying back all of the data and reinstalling/configuring all of the programs. If that does not resolve the issues, then there is some hardware issue at some level and it will be time to look for a new computer; or, the user is doing something, or omitting to do something, to properly secure the computer. For example, there is no point in doing a clean install and then download keygens and hacked, pirated software and then the user wonders why their computer is acting up again! I am not at all directing that comment at you, since I see no evidence of pirated software ... but I have come across that too! You do have to be careful which websites that you visit. Having robust anti-virus and anti-malware protection programs, with real-time protection, is an essential component of computer security, that, and creating regular system images (backups).
I will await your decision. Thank you for keeping me up to date.
Have a great day.