Sounds like somebody clicked on one of those
"Your internet connection could be faster!" windows.
All I can say is google that.
I found this comment about it, you may try this...
"I've had the same problem for a couple of weeks. Yesterday I started searching for a cure. I tried a couple of free anti-adware downloads, but nothing did any good. I was thinking that if I could find it, I could kill it. As simple as it sounds, I did a search on my hard drive for "Internet Speed Monitor" and there it was, living in my program directory (documents and settings\owner\startmenu\progr... It had its own folder and even included an uninstaller. I ran the latter, rebooted, and haven't had a pop-up since. Good luck!"