Well avast doesn't block, but scans and alerts to infection, but it doesn't block. So are you saying avast is alerting when you try and use your printer ?
If you are saying avast is alerting, it is a) best to confirm the detection one way or another and b) if a false positive report it so it resolves the problem (for all users) and not just avoid the alert.
What is the infected file name, where was it found e.g. (C:\windows\system32\infected-file-name.xxx) ?
You could also check the offending/suspect file at:
VirusTotal - Multi engine on-line virus scanner and
report the findings here the URL in the Address bar of the VT results page. You can't do this with the file securely in the chest, you need to extract it to a temporary (not original) location first, see below.
Create a folder called
Suspect in the
C:\ drive. Now exclude that folder in the
File System Shield, Expert Settings, Exclusions, Add, type (or copy and paste)
C:\Suspect\* That will stop the File System Shield scanning any file you put in that folder.
