In Enterprise Console the following error code and error message are reported:
a04b0003 The attempt to delete the infected file <filename> failed due to unknown error <error details>.
This error message is generated when Sophos Anti-Virus for Windows 2000+ cannot delete an infected file.
What to do
Go to the affected computer and analyze what has happened from there. See Sophos Anti-Virus: removing viruses on the local computer for details.