I like sugary breakfast cereal. I'm kind of a traditionalist - Frosted Flakes and Captain Crunch are my favorites - but I dig some of the newer brands, too. I'm also a big fan of wines from the southern Rhône; man oh man, there's nothing like a glass of Châteauneuf-du-Pape with a big bowl of cassoulet.
But.
Most folks would agree that pouring a bowl of tasty Captain Crunch and then adding to it a cup of delicious Rhône red would lead to unsatisfactory results.
Running antivirus software is a great idea; everybody should do it, and there are lots of good options available. Running two antivirus programs at the same time, though, is about like mixing wine and cereal - it's all going to end in sadness and tears.
Antivirus software can be resource-intensive, competing for time from your CPU or your disk subsystem. If you run more than one antivirus product at a time, the resulting load can often be even greater than just the sum of the separate products. This is because they're fighting over the same files and data at the same time. They'll get involved in a tug-of-war over files as your system is accessing them, they'll argue over whether each other's files are viruses or not, they'll call each other names and flood your logfiles with complaints, and in the worst cases, their intransigence can cause your system to lock up entirely for minutes or more.
On the other hand, it can be worth having a second anti-malware program installed, as long as you don't have it memory-resident or running in the background. For example, I have both Malwarebytes and Spybot - Search and Destroy installed on my system, and run them manually every other week. This can be a great way to get an additional layer of protection without making your computer resent you forever.
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