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Sophos Anti-Virus for Windows 2000+: Installation fails with error 3000

Issue
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.

Sophos product and version
Sophos Anti-Virus for Windows 2000+

Operating system
Windows XP Professional SP2

What to do

  1. Remove C:\Windows\Temp\Sophosreboottest.txt.
  2. Re-install Sophos Anti-Virus.

Refer also to the knowledgebase article Computer repeatedly requests reboot during installation.

If you need more information or guidance, then please contact technical support.