Sophos Labs, the threat testing division of Sophos, has recently reviewed the effectiveness of UAC (User Account Control) in Windows 7 in protecting against viruses, trojans, and worms. Their tests showed that some of the most potent viruses will break through the UAC.
The results of this study suggest that UAC offers little protection for your computer and you still need a good anti-virus to protect your system. TrialWorks began using Sophos products last summer and we have been thrilled with their effectiveness.
Most of our sites, that are managed by our networking team, operate the Sophos Security Suite for SMB. http://www.sophos.com/products/small-business/sophos-security-suite/ . It offers in depth messaging protection, anti-spam, anti-virus, application control, and firewall. We have been especially pleased with how well the anti-spam systems work.
In addition to deploying Sophos at our client sites, we also completed an extensive roll-out of Sophos on our own networks. Our environment is far more complex and includes dozens of servers. We are pleased not only with how easy it is to deploy and manage, but also how well it interacts with our virtual infrastructure.
http://www.sophos.com/blogs/chetw/g/2009/11/03/windows-7-vulnerable-8-10-viruses/