Bitdefender Internet Security
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Full user review
Quiet working in background. No need to scanning (except after installing). It work all alone. DO NOT slowing computer at all!!
Not free - but, if you like your computer.....
I tried a lot of programs - some very beatifull. KIS is verrry good, but slows internet. With Norton NIS virus came in and troubled my new laptop.
With Bitdefender IS I have no such problems.