When right-clicking on any file, Windows Explorer crashes. If you Exit PGP Service in the Windows System tray, the issue no longer exists.
An analysis of the crash dumps might show references to
Comments: Lumension Device Control Shell Extension
ProductVersion: 10.3.0 (Build 8741)
FileVersion: 10.3.0 (Build 8741)
FileDescription: PGP Client Library
LegalCopyright: Copyright (C) 2013 Symantec Corporation. All rights reserved.
LegalTrademarks: Symantec ,Pretty Good Privacy ,PGP ,the PGP
This can be caused by an incompatibility of the PGP Desktop context menu which hooks into Windows Explorer in combination with the Lumension Device Control Shell Extensions.
The problem was seen on Windows XP running Lumension Endpoint Security 4.4.1206 and PGP Desktop 10.3.0 8741.