Right after sending the message I thought to disconnect page.usegoogleanalytics call and all ok.
Since yesterday afternoon I have taken up with this theme.
I searched INet, followed in the footsteps of several web pages, who wanted to delete the virus, and I did not get it. I installed malwarebytes, I used CCleaner and avast antivirus, I cleaned windows registry, manually boot services, cleaned data program from user profile directory, deleted in chrome google as default search engine, I broke the boot of several programs that I had to restore and nothing ...
I also looked for information in the forum and there was nothing.
And today I ask, and it seems that it was a well-known topic ... Some users NOW say that the same thing happens to them. Sorry to say: I do not understand.