We found the infected machine and we cleaned it.
We don't have the problem anymore.
The infected machine was the one that never had the problem
When we disconnected the network cable from it nobody had the BBB
problem, when we connected it some people had it
I'm having the same problem with IE7 and firefox, sometimes a string
of 20 Bs followed by dozens of questions marks are inserted into
webpages at the very beginning, before the first html tag. In IE7 the
question marks seem to be replaced by regular spaces, so only the Bs
are visible on the webpage. This happens on and off on various pages,
like google.com
Neither Ad-Aware, Spybot, Norman antivirus or the Kaspersky online
scanner could find anything related to it. It also slows down the
internet connection, I think. Sometimes it also fails to show pages
like developerfood.com, instead just showing some garbled junk
(starting with the Bs, of course...) kinda like viewing a zip or rar
file as plain text.
If you managed to clean the infected machine, what exactly was it
infected by?