Some anti-malware software only supports newer versions of OS X. If you're running an older Mac, use this instead.

Some folks aren't comfortable upgrading their Macs' operating systems, and continue to use versions that aren't well-supported by new software. Fortunately there's still a solution for Macs running OS X Snow Leopard.

S.C. writes:

Will the adware removal software you've written about work on 10.6?

Mac Help

Every Tuesday our Peter Cohen brings you Mac Help — a column where you can get your OS X questions answered and problems solved!

10.6 (Snow Leopard) is a fantastic version of the Mac operating system that many users are still quite happy with. And if you're happy with it, why upgrade, right?

Well, frankly, I can think of a million reasons to upgrade — Yosemite on a newer Mac and iOS 8 on modern iOS devices is a powerful combination. But I recognize that not everyone is quite as anxious to uproot their Mac's operating system as I am. It's scary! And it's sometimes a one-way trip.

The Mac adware removal software I've written about before includes AdwareMedic, Intego Mac Internet Security X8, and ClamXav. The first two apps require OS X Lion or higher, but ClamXav still works on Snow Leopard, according to its developer.

I'll be perfectly honest: I like AdwareMedic the best of any of these apps. I've had the best luck nuking the adware that's infested my family's and my customers' Macs. But if you're really not comfortable upgrading to something newer than Snow Leopard, ClamXav will work too.

ClamXav is free and safe to use. It can detect Mac-specific malware and malware that affects Windows apps too, so you'll keep your PC-using friends safe.

What's more you can set up ClamXav as either "passive" or "active:" You can configure only to scan the files you want to check, or activate "Sentry" mode to monitor your hard drive every time new files arrive.