Change to linux!!
Really, windows is just problems, not worthy the trouble.
I migrate my father computer to linux, using Kubuntu.
Before the migration, already changed the email to thunderbird and the office to openoffice (now libreoffice), saving as odt, but teaching to export documents as PDF when sending to others (and solve the .doc/.odt support by others). Média player also setup to VLC and browser firefox.
After more than half year using windows and open applications and solved any difficulty encountered, i finally replaced windows by linux.
In linux, the apps are the same they used in windows, so the migration was easy. I just configured quick-launch icons for the needed apps, associate file extensions to the correct apps (mostly videos to vlc), saved authentications in main sites and main bookmarks in bookmark bar and setup digikam to import the pictures from the camera.
they only had 3 problems: using floppies ( yes, it was some years ago :) ,they didn't umount then all the times... solved by using a sync option for floppies.
Another problem was the .exe files ... most of then are virus, so it IS a good thing they can't execute then. only once it was something useful, so i remotely setup the wine, so they could run the .exe and after that i disabled the wine ( i don't want then executing random things, even on wine).
The final problem was the login page, i was ready to remove it, as they use only one account, but after some days they got used to it and i let it there.
My father uses today linux even better than what he could use windows. My mother only uses the browser on some sites (mostly banking) and have the same difficulties as in windows.
Right now the also have a tablet (BQ edison), that help the quick email check and browsing, making the PC less used.
So migrate to linux if they really need a full PC, install every app they need and configure everything. If not already, replace in windows everything you don't have in linux, to ease the migration (changing less things at same time is always better)
If they don't really need a PC, buy a tablet.