From the log, it seems that your LiveUpdate is damaged, apply these steps to uninstall and reinstall it:
Click Start > Settings > Control Panel.
Click Add or Remove Programs.
Click LiveUpdate.
Click Change/Remove.
Follow the on-screen instructions to uninstall LiveUpdate.
In Windows Explorer, delete the following folders if they are present:
C:\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate
C:\Program Files\Symantec\LiveUpdate
Install LiveUpdate using LUSETUP.EXE located in the SEP installation files, in the following folder:
...\SEPM\LUSETUP.EXE
To register SEPM with LiveUpdate:
Click Start, then Run.
Type cmd, then click OK. This will bring up a command prompt.
At the command prompt type cd and the path to lucatalog.exe. By default the command would be:
cd C:\Program Files\Symantec\Symantec Endpoint Protection Manager\bin
Type lucatalog.exe -update
To register the SEP Client with LiveUpdate:
Click Start > Settings > Control Panel.
Click Add or Remove Programs.
Click Symantec Endpoint Protection.
Click Change.
Click Next, select Repair, and click Next again.
Click Install.
Click Finish.
Regards,