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I prefer norton for its ease of use, but it depends on how active you want to be with it. Norton is almost install and forget, which I like. Just have to make sure it updates itself every so often, which is usually done automatically.
There are tons of freeware and cheaper options though.
Sometimes the windows program itself can skyrocket cpu usage, sometimes itunes will do it to. You have an older processor, but it happens to everyone occasionally.
Also if you have a mechanical hard drive you should upgrade to an ssd. It makes everything better. I'd suggest samsung just because it is the easiest to deal with as it comes with all the software you need in the ssd package.
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