Kaspersky is good but... it does drain a little bit from your computer, so it affects gaming perfomance. What I do is simply unplug the internet when I'm going to play and switch off 'K'.
Most gamers, well many that I know, prefer Nod32; which I dont really like since it's not as good as 'K' but it's fairly similar (top 5 AV IIRC) and it drains way less than 'K'.
Then again, just buy a Mac. =P
(just kidding)
PS: You're not infected unless you accidentally clicked on those links... or maybe if youa ccepted a file transfer from them, so I wouldn't be as worried for your computer, they should be worried about theirs... then again it's not a really harmful virus, but rather an annoying one.
Disclaimer. I was too lazy to boot up Firefox, so I appologize for any spelling mistake hehe.

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