Don't worry about it. Its quite often just a webpage that has a picture of a virus warning, I don't think your computer would warn you if you actually have a virus. Just don't buy any of these so-called solutions. There's a scam circulating that says that you need to pay €100 to clear your computer of 'juvenile porn'. Also, if you do have an anti-virus, it may flag normal activity as being dangerous; safety first approach.
And finally, no I don't get the warning either.
If you need more detailed advice, just ask, I'm good with computers