suspicious update popup

Capture.PNGToday I have started getting this pop up on my desktop as soon as I boot. I scanned with  Norton 360, PC checker and Power Eraser. They did not find anything, including root kits.

But the message is suspicious since the text is garbled and the close button is not aligned. This is the first time I see this kind of popup on the desktop. I visited a web site linked from Blogspot.com (I forgot which site it was, but it had a video) and this pop up started right after that. Please help.