Finally I spotted ComboFix and ran it. I did not understand the log, but I think ComboFix did remove many infected files. After, I have been able to update Windows and it is now 24 hours and everything seems all right..
To day I tried to run ComboFix on my computer at home. I don't think I have malware problems, but just to be sure. I got the log and I would like to understand it. Is there someone who can help me in this ? If yes, I will attach the log file in my next messaage.
Thanks