Hi michelle, I did not create a case since the workaround from Symantec Using Task Scheduler works. I created the task using my admin account.
But can you check below;
Give Full Control permission to the SYSTEM account
1. Start Windows Explorer, right-click the computer's root hard drive, and then click Properties.
2. Click the Security tab, and then click Add.
3. In the Select Users, Computers, or Groups dialog box, click the SYSTEM account, click Add, and then click OK.
4. Under Allow, click to select the Full Control check box, and then click OK.
5. Click the TEMP folder and then verify that the SYSTEM account has full control.
Verify the registry permissions
1. Click Start, click Run, then type Regedt32.
2. For each of the registry hives, follow these steps:
1. Select the hive.
2. For Windows XP, on the Edit menu, click Permissions.
For Windows 2000 and Windows NT 4, on the Security menu, click Permissions.
3. Verify that the SYSTEM account has been added and that it has Full control. If it does not, add the SYSTEM account with Full control.
Can you also check Liveupdate & And Symantec Event Manager's dependencies.. This would be RPC (Remote Procedure Call)?