Do as follows
Reinstall liveupdate
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 one of the following folders:
...CD1\SEPM\ or ...CD1\SEP\
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.