Yesterday one of my own sites came up with this....
http://www.uoforums.com/uof.PNG
Now, I don't even host with this...streamline.net, so I have no idea who they are
When I put in a manual proxy in IE's proxy settings, it went away and the site loaded AOK
Today, I removed it and everything SEEMED to be ok, but i'm getting it again on some sites I visit