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I use Trend Micro. $24 for 2 years, up to 3 PCs. Considering that HDD cost you hundreds, and that video card cost you hundreds, and that OS cost you hundreds (if you even bought it), then it's worth it. So much headache having to re-format your perfectly set up gaming system due to some shitty virus. Oh and if you back up those files before format, what's to say you didn't just back up that virus with it?
But hey I use Trend Micro because it works and I've been using it for years. There are free ones out there you can consider.