We have also had this issue and the solution provided in Document ID:
2009042115381848 brought
no effect.
We found out that the affected Machines are all in OU where "Trusted Publisher Lockdown" in the Group Policy is activated.
Please check if your machines have also this option active in the Group Policy.
If so, there are two ways to solve the Problem:
1. Disable "Trusted Publisher Lockdown" in Policy
or
2. Import the Symantec Digital Signature to Trusted Publisher Store
(IMPORTANT: Computer Store!)
(Digital Signature can be found (and saved) in properties of each symantec executable, for example rtvscan.exe)
Regards