Here’s the Deal
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When comparing Kaspersky Free vs Microsoft Security Essentials, the Slant community recommends Microsoft Security Essentials for most people. In the question“What are the best free anti-viruses for Windows?” Microsoft Security Essentials is ranked 4th while Kaspersky Free is ranked 5th. The most important reason people chose Microsoft Security Essentials is:
MSE doesn't seem too resource intensive
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Pros
Pro Top rated in comparisons
Pro Will watch over email and web sites
Pro Not the lightest on resources, but not the worst either
Pro Can set preferences about how to deal with PUP's and other notifications: ask, quarantine, or exclude
Pro Performance
MSE doesn't seem too resource intensive
Pro Simple and Silent
Does the job without distracting you.
Pro Less prone to false positives compared to other solutions
Frequent false positives in themselves can reduce security
Pro Ease of Use
Pro Accuracy
Cons
Con Russian company
Russian company. Banned by British and U.S. government for collecting and sharing data with Russian government.
Con Used as non-competitive baseline since 2013
All except one tested antivirus scores above Security Essentials.