My laptop system is Windows 7 Ultimate 64 bit (Intel Core i3 CPU).

Most of the antivirus programs slows the system. I've been using Avast free antivirus for a while but then it turned out that Avast interfares with Windows fireawll eventhough I close the feature, so I need another one hopefully that doesn't.

What would you suggest?

  • 1
    What's wrong with Windows' antivirus?
    – user416
    Dec 13, 2016 at 12:23
  • Do you mean windows firewall? I don't know any other windows antivirus.
    – Lilyum
    Dec 13, 2016 at 17:19
  • 1
    No, I mean Security Essentials
    – user416
    Dec 13, 2016 at 18:39

1 Answer 1


Why don't you just use Microsoft's Security Essentials. It works fine on Win 7 and does reasonably well in antivirus tests.
If you are not the risk-taking type it is good enough.

I experience no slowdowns because of it. Early in 2016 there was a lot of hassle in combination with Windows Update, where Update would take ages especially if Essentials was also running, but that has been solved.

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