Internet Security Software Vendors List
An alphabetical list
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Recommendations for Security (antivirus) Software
Free antivirus programs:
For low-resource PCs - Microsoft Security Essentials (for Windows 7, now unsupported) or Windows Defender, which is preinstalled on Windows 10 PCs. Windows Defender has been improved substantially over the past few years since its introduction. Malware detection rates are close to being on par with other free commercial antivirus programs.
Note: Windows 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 Windows Defender.
However if you would rather install a free commercial antivirus program for most PCs, BitDefender Free, Ad Aware Free, Panda Free antivirus and Kaspersky Free Cloud are all excellent quality programs.
Paid antivirus Suites:
For most PCs - BitDefender Total Security, 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.
For PCs with more powerful processors Norton Security Premium is a perennial top performer and Kaspersky Total Security is also near the top.
Free and Paid Antivirus Scanner Software:
If you need a good on-demand antivirus scanner look no further than Malwarebytes Free Version. Malwarebytes also has an excellent, if pricy, paid version.
Comodo Cleaning Essentials is also pretty good and can be run from a flash drive.
Also, SuperAntiSpyware Free is great for cleaning out some spyware that even Malwarebytes can miss. As with Malwarebytes, SuperAntiSpyware also has a paid version.