Went out to my computer store today for different things, and took the opportunity to ask about all the issues with W10.
He told me that all the issues are related to upgrading or downloading of W10 while on W7 or whatever you've got running.
Their free upgrade caused all these problems.
The solution is to uninstall W7, THEN install W10 from scratch; doing that he said, is the key; W10 works great then.
Hope this helps someone.
Good luck.