Before installing Sophos, un-install any anti-virus protection software that is on your computer. These instructions assume an old version of Sophos on Windows Vista, but should also work for Windows XP and earlier versions.
You must have a working Internet connection for these instructions to work.
See the Sophos Configuration brochure
ITS requires that your Norse Key password be changed every six months for security reasons. When this is done, you must also update your password in Sophos in order to continue downloading anti-virus definitions and keep your computer protected.
Instructions on how to update your password in Sophos can be found here
When installing Sophos Anti-Virus on a computer running either Windows XP (Home Edition) or Windows 7, one may encounter the following error message:
‘You do not have sufficient privileges to run the Sophos Anti-Virus main application. You are not a member of one of the Sophos groups. In order to be able to launch this application, you must be a member of SophosAdministrator, SophosPowerUser or SophosUser group. Please contact the Administrator.’
The steps to resolve this can be found in this article