Security Suites
There are a number of security suites available now that include a firewall, antivirus scanner, spyware scanning and a spam blocker. Some of them may not include a spam blocker but most do.
Advantages of a suite:
The different modules should 'play' well together (no conflicts). One price
for everything. Updating is generally automatic with no input from the user.
Disadvantages of a suite:
The different modules may not all be the 'best' at what they do. Some may
have a better firewall while others my have better virus protection.
One thing of note, the suite in question should have options to turn off any of the modules. This is important as a user may actively dislike one of the features and the user shouldn't have to uninstall everything to stop using the disliked feature.
More and more of the commercial products offer a free online scan. Please be aware that many of these online scans will not clean what it finds. I find this to be a deceptive practice.
Security Suites List (page one)