Thanks for you help on this.
I tried a system restore but Windows 7 told me it was unsuccessful. Then I activated windows updates but it ran endlessly so I think it is dysfunctional. I think Microsoft may have disabled these features in order to push everyone to install Windows 10, which I don't want to do.
My fear of hack or infection was based on a few things going wrong at once. 1. malfunction of Ctrl+v for paste in certain (not all) cases. 2. Inability to login in to one app.
Since then I have found out that the app problem was because on the admins there misconfigured the login data. This has now been corrected.
The only problem that remains is the ctrl+v issue.
I was just able to paste the last sentence using ctrl+v: "The only problem that remains is the ctrl+v issue." So I don't yet have an answer to that.
I don't think now I have to do a reinstal of Win7 now or that I am infected. So I am marking this thread as Solved.
My last question is: Would it be good practice to run the programs you advise (MBAM, CCleaner, etc) regardless of infection?
Thanks again for your help.