I'm running Windows XP Media Center Edition. When I run escw_90_sa_sfx.exe, it installs and I get the "Welcome to the Sophos Endpoint Security and Control installation wizard".
I go through that, choosing to install Client Firewall as well and choosing Remove third-party security software (although not choosing these makes no difference). And we get to, "The installation wizard is now ready to install..."
I then get a message saying "Another anti-virus product is installed. Sophos Endpoint Security and Control cannot be installed until this product is removed."
As far as I know, I have removed any other anti-virus product. Help files told me to look for a file called "Sophos Anti-Virus Competitor List.txt", but this is not to be found. I guess this is a registry key issue, but do not know how to proceed.
(I've tried with and without the Firewall in Windows Security Centre turned off.)
Henry