The best replacement for microsoft security essentials is avg.

The best alternatives to microsoft security essentials are rated as following:
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★★  kaspersky
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★  avg free
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★  webroot
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★  malwarebytes
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★  norton internet security
  bitdefender
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  north 360
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  trend micro
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  symantec endpoint
  vipre
  avg 2011
  zonealarm
  comodo
  norton internet security 2011
  nod32
  panda cloud
  window defender

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Speaking about microsoft security essentials, one probably shouldn't forget about avast.

Other search terms related to microsoft security essentials and their ratings are:
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★★★ mcafee
★★ malwarebytes
★ defender
★ avira
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