Apparently, my PC works fine.
I have detected a program called CENF.EXE, who was accesing to IP 18.104.22.168 port 119.
When I cancel this program from the task manager, it reactivates automatically when I run any program.
Also, when I'm trying to access to REGEDIT, appears an error message "Memory access violation in module kernel 2 at 4849: ..." etc..etc
I think it's like a virus.. or a trojan horse.
I don't want to reinstall my Windows. Any help ?
Meanwhile I change the routing of that IP to anywhere.