On a local machine you can check the excluded directories off Symantec Anti Virus in the following registry key:
[HKEY_LOCAL_MACHINE\SOFTWARE\Intel\LANDesk\VirusProtect6\CurrentVersion\Storages\Filesystem\RealTimeScan\FileExceptions]
For Windows 2008 (64Bit) and Symantec Endpoint Protection (SEP) 11, look at the following location:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Symantec\Symantec Endpoint Protection\AV\Exclusions\ScanningEngines\Directory\Admin