Something nasty almost happened to me yesterday.
I was quietly beavering away at my computer when the antivirus program started ringing bells about malware appearing on my computer - about one item every ten seconds. It took me about a minute to realise that I was under attack, at which point I quickly unplugged my internet dongle, but I was unsure if damage had been done. The only clue remaining to show the attack was that the browser download window was open in the background, but did not show evidence of any new download.
Over an hour later, the full antivirus scan had found nothing. A reboot involved the usual delay due to "updates for everything" being installed. Since the antivirus had found nothing, I downloaded Spybot - Search and Destroy to check for anything the antivirus had not found. That's bitter experience from the last time I was attacked about three years ago. Thankfully, all it appears to have found are the cookies in my browser (never heard of Zedo before).
Did I do well - could I have done better?