Ernest Juchniewicz
Ernest Juchniewicz voted up Didge Doo's answer

By far the best option is one of the freebies from Microsoft.

If you're using Windows 7 that will be Microsoft Security Essentials. If you're using Windows 8 the name has changed to Windows Defender.

It may be that the name will change again at the end of this month when W10 is released.

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