V3 Lite.
Its free, and up to 8x stronger than the windows one.
Job Done.
60secondrule
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avast! (it is spelled always with a lower-case 'a' and exclamation point (!) at the end.) It can be free or you can pay for extra-safe web transactions (which is not necessary). It keeps your computer safe (completely saved mine once), so what more could you want than a strong, free antivirus? avast! is the best.
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