You may want to update your virus scanner software just to be on the safe side. There has been a nasty worm floating around for about two months now that tells you that your anti-virus software must be immediately updated and to click here. When you click the balloon you are really downloading the virus into your computer. The virus/worm goes into your PC and eats the files one by one in My Documents. The upgrade from AVG to nail the sucker was fairly large, about 12-megabytes. I'm not sure the other anti-virus programs have provided an update at this time. I use the new Google Chrome browser and I do not get the message you described.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)