unwanted

For about a week now I have been assailed frequently by the window shown in the attachment. Note: I can't see the attachment in preview, so I don't know if it will be seen by you. At the top, the window has "Top Apps". I don't recall agreeing to have this thing, and I don't want it. It pops up...

Recently my wife's laptop started downloading a Windows 10 update. This knocked her machine out when she was waiting for an important email. Yesterday the same thing happened to my laptop when I was preparing documents for a meeting. This morning my tower started downloading a Windows 10...