Thanks for the quick reply!

I have followed the procedure described and here are the logs requested. The only thing I want to mention that I have disabled all Avast! shields before running Combofix as was described, but Combofix still gave me a warning that Avast is running, after which I proceeded anyway. Combofix seems to finish successfuly nevertheless.

Anyway, now my Avast antivirus is turned off after reboot. Is it safe to turn it back on ?