When you try to install Sophos Anti-Virus on a computer that previously had a non-Sophos anti-virus product installed, Sophos Anti-Virus fails to install and displays the error:
Error 3000. A previous version of Sophos Anti-Virus already exists, a reboot is required.
Rebooting the computer does not resolve the issue.
First seen in
Sophos Anti-Virus for Windows 2000+
A flag file created to track a reboot has not been deleted.
What To Do
- Re-install Sophos Anti-Virus.