Both Bitdefender and Kaspersky get mixed owner reviews, but not for failed antivirus protection. Owners say that works fine. But both brands have dismayed their share of users by automatically renewing the software at the end of the year by default, or annoyed them with unresponsive customer support. Kaspersky gets more complaints for irritating pop-ups and bogging down the computer, though.
It should be noted that for PC users, Windows Defender (or Microsoft Security Essentials for Windows 7 and earlier) comes with the tech giant's operating system. It provides basic antivirus security, but testing reveals that protection levels are far below that of the best paid antivirus software. Even many free antivirus programs outperform Microsoft antivirus software by a substantial margin -- and we cover the best elsewhere in this report. Be aware that if you install a separate antivirus program, you may need to disable Microsoft's tool first to prevent performance issues.
While the premium edition of Avira antivirus updates virus definitions every two hours the free version does it every six hours. The security software also has an android app that can prevent device theft. When compared with the earlier versions, the latest Avira free antivirus consumes less system resources while providing better protection to the system. User reviews on Avira free antivirus state that the is good at checking viruses, Trojans, rootkits, malware and spyware. of Avira antivirus is offered at several websites including the .