Interesting how you refuse to even acknowledge all the facts, hints, tips and suggestions, DesertFox
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There is absolutely no need to buy AV software, as free ones are at least as good as payware, sometimes even better, as they have way higher update intervals. E.g. Avira and Avast update the signatures daily, sometimes even more often. Many payware doesn't keep up with that.
Chrome might be nice and fancy, but it nevertheless is a "fresh" and pretty much beta browser, which doesn't even have the benefits of other open source or free browsers who profit of their niche existence, meaning hackers prefer focusing on the "big" browsers, obviously.
And, Chrome is Google. All the more reason not to use it. I'm not usually hyper paranoid, but I'm very paranoid with information I'm putting on the web. What you put in the net, the net never forgets. And as I have a whole life ahead of me, I'm not interested in every aspect of my life being logged&stored, especially not by a mega concern like Google (just think of the "web protocol" which tracks&logs all your google search inputs automatically...). That's also why I despise social network stuff like Facebook or (the german counterpart) StudiVZ.
Oh yeah, and if your computer has been infected with a virus, the only wise thing to do is to format. Once a trojan/virus has become active, it's common standard they make a mess all over the system secretly, even though your AV software (doesn't matter which one) might call it "clean". there is just no way to be sure. Your computer now is compromised and there can be all stuff going on. Security holes/backdoors opened in your browsers for more viruses or even hacker "entry points", reprogrammed AV softwares (e.g. the first thing most trojans do is silently making AV updates impossible and taking over the AV search engines so they are untraceable.
Once they're in, wipe clean.