Anti Virus for XP?

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Looks like MS Security Essentials no longer works on XP, what are others using? Preferably free.

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Both my XP PC and my XP VM are still getting updates, but I'll look at the hack, thanks. I only use them for XP only stuff, no real online stuff or web browsing, so AV is not really essential. I'll look at AVG, use to run this years ago but it became a bit bloated, any other AV suggestions?