Thumbs up to Jackie007.
Have a look at this KB as well
From MS KB http://support.microsoft.com/kb/822158 (Virus scanning recommendations for Enterprise computers that are running currently supported versions of Windows)
Turn off scanning of DFS files
The same resources that are excluded for a SYSVOL replica set must also be excluded when FRS or DFSR is used to replicate shares that are mapped to the DFS root and link targets on Windows Server 2008 R2-based, Windows Server 2008-based, Windows Server 2003-based, or Windows 2000-based member computers or domain controllers.