Avast Internet Security
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Full user review
"An outstanding and reliable product"
I have the paid version and it is worth it. I'm a careful internet user but Avast has several times caught a Trojan horse on sites I thought were reliable.
Avast occasionally seems intrusive. It kicks in while I am in the middle of posting something and then my system slows down until Avast finishes. Most noticeable when I'm using Twitter.
Avast is a good investment in your internet security!