I just installed the free version on a laptop with the latest Windows 10 update and I am not sure why I can not enable Anti-rootkit. I have two messages and one of them is to enable Anti-rootkit, but the software will not enable it when I click on the button.
Does repair help? https://support.avast.com/en-eu/article/Repair-Antivirus
If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A