Anti-Virus Does Not Remember Authorised Software

Hello,

I have Sophos Anti-Virus 7.6.19 installed on my Windows 7 32 bit machine. When performing an initial scan, Sophos identified two security threats; both were programs that I trust and use regularly, so I authorised them in the Sophos interface. The programs are PunkBuster (Anti-cheat software used with online gaming) and ShellExView.

Every time I load Bad Company 2, a game which uses PunkBuster, Sophos declares that it has found and quarantined a threat, despite my attempts to authorise it. This makes my game run incredibly slowly until I open the Sophos interface and authorise it again, and the problem is gone until i close the game and create a new instance. Neither Sophos nor ShellExView are in the list of authorised programs, so for some reason Sophos does not remember that I have allowed them.

Does anyone have any idea how to solve this issue?

Thanks in advance, Darth Gazak