Good free antivirus for window 7

Hello,
during intalling antivirus, is window 7 sped become slow or their is need to off the security? kindly guide me about this.
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More about good free antivirus window
  1. Microsoft Security Essentials
  2. Here are some free ones

    http://www.comodo.com/ (Anti Virus / Firewall)

    http://www.avg.com/us-en/homepage (Anti Virus / Firewall)

    http://www.malwarebytes.org/ (Anti-Malware)

    Yes you always need to have anti virus / firewall / malware removal of some sort.

    The only anti virus that will slow down your computer is Norton's
  3. Avast - me hearty!
  4. Avira free edition plus malwarebytes free edition,and ccleaner also free!
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Security Antivirus Windows 7