Recently, upon start-up (but not every time I start up), a pop-up flashes on my screen.  It doesn't appear long enough for me to read it, but it starts out "ruh roh" and then says something about a missing connection to the "interweb" or "interwebs."  I have run a full scan, and nothing has been detected.  I haven't noticed any other problem with my computer.
I tried searching Google but couldn't find any report about this.  Does anyone know anything about what this is?