I have a few suggestions:

  1. Instead of having your settings as “Delete” when a virus is found, change it to put in “Virus Chest.” You may accidentally get rid of a vital system file by deleting it. When it is in the Chest, it is safe and away from other parts of the machine, and can later be scanned again to make sure it is real malware vs. a false positive.

  2. Did you install Sophos while you had Avast installed or did you uninstall Avast using the Avast Uninstaller Tool while using Sophos? The reason I ask is because you can’t run 2 AV’s at the same time because it creates havoc and can create false postitives.

  3. Do you have MBAM (Malwarebytes) on your machine? If not, I recommend it (esp. the Premium version - resident). It compliments Avast yet works differently and layers your security protection.

Otherwise, follow the instructions for attaching your logs in the previous post so a malware removal specialist can review them. Let us know if you have any questions. Thank you.