Strange occurrence. I was reading a bio on www.amg.com (using Firefox), when a Windows type box opened in the center of the screen. Best description of it would be an animation with books or files being rearranged on a shelf. The text in this small box read *similar* to "rearranging files to optimize system speed." I could not close this box or navigate the site until the box closed itself - about 15 seconds. Any ideas? I am running Windows 98SE, and have NOT added any software or hardware recently. A virus scan and a spyware scan were uneventful. I repeat...any ideas?