I would not wish to appear biased towards any contributor here but in defence of Sphinx:
I take a monthly computer magazine which features a helpdesk; you can’t help but notice that so many answers to readers’ problems is that they are running several virus protectors at the same time which is causing conflicts and hence the problem they writing about. Incidentally, the virus protector of choice at the moment is F-Secure, apparently one of the cheapest. I am in a bad position myself currently because I am running Windows 64-bit operating system and waiting for any protection by anybody to be released.