I haven't recommended Symantec or McAfee for years. They have become bloated and a liability.

The one I currently use is Eset NOD32.

NOD32 Antivirus Protection for Your PC: Antivirus for Windows XP and more

IMO, you don't need the suite just the AV/AS part. I use Microsoft's Forefront security too although I don't recommend it for home users and I don't recommend MSFT's bloated OneCare solution (which they're withdrawing anyway).

And I'm sure the clueless Mactards will come in saying their system is more secure. I'm not putting all Mac users in this category. Just the ones that are blindly ignorant on security.

Macs Aren’t Safer, Just a Smaller Target - Gadgetwise Blog - NYTimes.com

Mac Security Part II: It’s a Numbers Game - Gadgetwise Blog - NYTimes.com

And they'll probably have comprehension issues with these articles like the Macbois in the comments section do. So to summarize:

- Vista had about the same number of serious vulnerabilities as OS X last year (28 vs 27).

- It is true that the Mac is not yet a big target for malware. Some experts say it will be when its marketshare reaches 17% to 20% . So you won't see Mac malware headlines in the news like the recent ones about Conficker (which wasn't an issue if you patched your system with free Windows updates which were first available last October).

- If you have a Mac and visit questionable site (porn, warez, codec pack and generally "too good to be true" offers), you are vulnerable to malware.

- If you don't have AV/AS software, you don't know if you have malware on your system. Most modern malware tries to hide itself and use your system for the malware writers profit rather than damage your system to make it not boot, etc.

- Even with malware detection, you aren't safe from phishing and some other types of online scams on either platform.