Issue
During installation you see an error message similar to,

Error 3004 - Sophos Anti-Virus cannot be installed due to some registry keys not having permissions

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

Operating system
Windows XP Professional SP2

What to do

You must open the Windows registry and check that certain keys have the correct permissions. Before you start ensure that,

• you have read the warnings about editing the registry
• you understand how to apply registry permissions. Details are given in knowledgebase article 13811.

Check the following registry keys ensuring 'Administrators' and 'System' have full control:

HKEY_LOCAL_MACHINE\SOFTWARE

HKEY_LOCAL_MACHINE\SOFTWARE\Sophos

HKEY_LOCAL_MACHINE\Software\Classes

HKEY_LOCAL_MACHINE\Software\Classes\Interface

HKEY_LOCAL_MACHINE\Software\Classes\Typelib

Once the permissions have been correctly added to the keys, you should be able to install successfully.