After installing PGP Desktop 10.0.2 on a 64-bit Windows 7 system and restarting the system, you receive the Windows pop-up:
Interactive Services Detection - "A program running on this computer is trying to display a message.
This prevents PGP Tray from running and PGP Desktop fails to open.
This occurs due to the new Interactive Services Detection feature available in Windows Vista and Windows 7. The Interactive Services Detection is a feature for legacy applications that detect if a service is trying to interact with the Windows desktop. This feature can be disabled by editing a service on the Windows computer.
Should this not resolve the issue and you still receive the error message, please make sure that you don't have the Lenovo ThinkVantage software installed. Refer to the following knowledge base article http://www.symantec.com/docs/TECH149542.