Hello Rups,

is it possible to get a Screenshot of the Avast Alert? Search in Start Menu for Snipping Tool to make a Screenshot.

Malware removers will be notified by an Moderator soon but it can take some time till they arrive,
so please be patient.

You have a really nasty Infection on there so maybe it can take some time to remove that.
Rootkits are except for File Infectors one of the badest things you can get on your PC.