Apologies for the delay, the original post was moved.
You have "malware", in the form of a rogue "Anti-virus, AntiSpyware or Anti-Malware" product. The rogue was probably downloaded through an HTML page, though without seeing exactly the messages you are receiving, it is difficult to pinpoint.
However, you should try the following link:
Good luck, and post back here with the results!
Thank you very much, problem solved with the MalwareBytes software. Only that I was (erroneously) thinking that McAfee Total Protection could handle all sorts of infections, but now I realize it does not, at least with this Malware.
An important correction to my previous post: the virus that McAfee reported is the HTML/FakeAV trojan type.
I leave as attachment the log from the MBAM software.
BTW, this was a nice Christmas gift!