Auto Sandbox technology is an exclusive feature of Antivirus for Windows. Comodo Internet Security for Windows comes bundled with the feature which creates an isolated, virtual system environment where all suspicious files and programs will be executed in trial mode before being granted access to your actual system. This prevents any virus or bug from modifying, corrupting or deleting actual data in your computer. The innovative feature provides stronger protection than traditional AV and any malicious files found will instantly be added to the blacklist.
Not quite as good as a premium antivirus app: According to security software tests from AV-Test, one thing never changes: you get what you pay for. Avira Antivirus Free might be the all-around best antivirus app that you don't have to pay for, in terms of speed, quality of scanning, and usability, but paid programs from Kaspersky, Bitdefender, and McAfee consistently edge it out. You can get some of these for pretty cheap if you shop around. And there can be fringe benefits as well to paid software -- for example, your version of Norton is always the latest one as long as you have a subscription, and McAfee suites can now be used on an unlimited number of devices.