Internet Security Software Vendors List
An alphabetical list
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Recommendations for Security (antivirus) Software
Always restart your computer whenever you install or uninstall any Security (antivirus) app, program, or Suite!
You might ask. Just what do we expect a good antivirus program to do? It should protect our PCs from antivirus intrusion of course. But antivirus software should do so much more.
See Neil Rubenking's excellent article Viruses, Malware, or Spyware: What's More Dangerous? for an in-depth explanation.
Don't allow your PC to go unprotected.
Choose one of these antimalware programs and install it Now!
Free antivirus programs:
Also: Where to find free on-demand antivirus scanning software.
For low-resource PCs - Microsoft Security Essentials (for Windows 7, now unsupported) or Microsoft Defender Antivirus, which is preinstalled on Windows 10 PCs. Microsoft Defender has been improved substantially over the past few years since its introduction as Windows Defender. Malware detection rates are close to being on par with other free commercial antivirus programs. In addition Microsoft Defender is the only free antivirus that includes any kind of Ransomeware protection.
Note: Microsoft Defender will not activate if any other third-party antivirus programs are installed on a Windows 10 PC. Remove any installed third-party antivirus program(s) and restart your PC if you wish to use Microsoft Defender.
However if you would rather install a free commercial antivirus program for most PCs, Ad Aware Free, Panda Free antivirus and Kaspersky Free Cloud are all excellent quality programs.
Paid antivirus Suites:
If you're paying, be sure your choice includes ransomeware protection!
For most PCs - BitDefender Total Security, Norton Security Premium, McAfee Total Protection, Eset Internet Security, Webroot SecureAnywhere, and Trend Micro Maximum Security are all highly rated and effective programs. If none of these suits you there are others with trial versions you can test for free, including Kaspersky Total Security
Note: Even though no testing was cited, the FCC Warns That Kaspersky Poses National Security Risk
Free and Paid Antivirus Scanner Software:
Malwarebytes (Free trial and Premium versions available)
Norton Power Eraser (If you include the Rootkit scan your PC must be restarted after scan.)
Comodo Cleaning Essentials is also pretty good and can be run from a flash drive, and is free!
Also, SuperAntiSpyware Free is great for cleaning out some spyware that even Malwarebytes can miss. As with Malwarebytes, SuperAntiSpyware also has a paid version.