re: Should I buy McAfee LiveSafe?

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No install Microsoft Security essentials. It is free and light on the system resources.

Install ad block on your favorite browsers and you should be fine.

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MSE has been rebranded as Windows Defender but this is what I do. Also, be sure you know how to restore from a backup. Actually walk through a dry run or two to be sure. Then you're pretty much covered.

I personally don't like McAfee, as others have already noted it is something of a resource hog.