We've just noticed this moring that Sophos has started detecting part of the ActivBoard software as a virus-infected file. See below for details :-
File "C:\Program Files\Activ Software\ActivstudioPE3\ACTIVcalc.exe" belongs to virus/spyware 'Mal/VBCrypt-C'
We've contacted Sophos regarding the problem and are wait to hear back from them.
This might well be the end of the road for Sophos in our school!