Not because you have to pay for it means it has to be better. somes are somes not.
i dont pay/have paid for any programs/games (besides NWN) so its the best for me, cos its FREE :D
and isnt that easy to remove a good virus like the one i got on old pc, i knew the virus, i knew its name, its location in harddrive and even its location in windows registry and it just would never go away wherever thing i did.
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First, I know it doesn't mean it's best if it's bought, but seeing as I have an awesome one, and had to buy it. And it's far better than any of the free ones I have tried, which are alot, I base my opinion off of my experience.
Then you aren't completely removing it. Most viruses aren't just 'one' file either, normally they have a few. If it keeps coming back, then most likely you are missing some of it's files, that isn't limited to the files that run the virus, but also any spyware and adware it brings with it.