Immunet FREE Antivirus is a simple cloud-based tool which can run alongside most antivirus packages to enhance your PCs security.

The program's cloud-based nature means it's very lightweight. Its two core processes typically consume under 14MB of RAM; even when scanning it peaked at around 16MB on our test PC; and of course there are no bulky database updates to download. Immunet always uses the most up-to-date information from the cloud.

On the other hand, the free version of Immunet doesn't protect you when you're offline. It has plenty of other restrictions: no "advanced detection and removal" of malware, no scheduled scans, no "deep scans for archived and installer files"; no automatic cleaning of infected files, no "advanced packer support", no scanning of email databases.

And it's slow, too. Even when we chose the Flash Scan, which limited itself to checking running processes and the Registry, the program took around three and a half minutes to finish. We've seen other antivirus tools run basic system scans more quickly.

Still, Immunet is supposed to be run alongside another antivirus tool, not used on its own, so maybe these issues aren't quite as important. And perhaps the program's major selling point is its lightweight design. If you're looking for extra antivirus protection which won't slow you down then it just might be worth a look.

And if you like the basic program then you can always upgrade to Immunet Plus, which fixes all of these issues (apart from scanning speed) and can be yours for $24.95 a year. Find out more at the Immunet site.

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Immunet 3.0 is slow, and basic. It's also ultra-lightweight and runs happily alongside many other antivirus packages, though, so if you're looking for a simple second layer of protection then it may be of interest.