I have tried a few times to initiate the download of additional files for the boot-time scan, but it doesn't work and so I can't access the additional settings for boot-time scan and also, I presume, there are some virus definitions that are missing and not being checked. I just see a message saying "Installing additional definitions", but it never finishes. I am using Windows 8.1 and I did a fresh install of Avast Free Antivirus yesterday, so it's the latest version.
Is this a known bug (I can see other references to it on this forum saying it is very slow) or could it be some malware on my computer preventing Avast from working correctly? If so, does anyone have any suggestions?
Thanks, everyone.