We deal with this and have to re-evaluate our secure networks regularly.
The old stand-bys:
1.Norton (Symantec) Anti-Virus (NAV2009) /Internet Security (NIS2009)
2. McAfee - various flavors (Total Protection 2009)
They both work "most" of the time. Not too good on Malware/Spy bots. People in the past have supplemented these with Ad-Aware (Lavasoft).
The ones that are starting to dominate NAV and McAfee are:
AVG and Kapersky. We have seen many cases where these have picked up virus/malware/spyware/etc. that NAV and McAfee missed. In addition, Norton and McAfee are incredible resource hogs...
We used all four for quite some time and as the final licenses expire, we have chosen AVG Internet Security (8.5 now) going forward. For us, it has proven to be the best for the items mentioned above including SPAM.
Windows Firewall is actually pretty good, but also remember, it is the most hacked.
Since it is for home use, it is not a big deal, but at some time you may wish to switch to a hardware firewall and then just run anti-virus on your local machine.
Of course you can be real hardcore and run Unix based OS which really lowers security threats, but they still exist.
Anyway, just some observations from real-world usage, FWIW.
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