If you dont mind about the Interface go for NOD32.Kaspersky 6.0 is the one I am cerrently using..before that I was a Norton fan but Norton is bad..System HOG..Kaspersky is very good.
Heard that Avast is a good free alt.
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"It's not a silly question if you can't answer it." Sophie's World [ http://en.wikipedia.org/wiki/Sophie's_World ]