The error below is seen when attempting to create a custom System Recovery Disk (SRD) when both Symantec System Recovery (SSR) and PGP Desktop Encryption are installed.
Error ECA307DE: Failed to unmount a previously mounted WIM file. A process or application may have a lock on a file within the mounted WIM content.
The Microsoft platform code is 126.
Right-click on the PGP Desktop icon (padlock) in the system tray and select 'Exit PGP Services' before starting the SRD creation. PGP services can be restarted when the SRD creation is complete.
This issue is fixed in PGP (now known as Symantec Encryption Desktop) version 10.3.x.
Another possible solution to this problem is to disable the service for 'IDrive Online Backup' (https://www.idrive.com/). If both SSR and IDrive are installed, the above issue may be seen.
Windows 7/2008 R2 x64
PGP Desktop Encryption