You can copy and paste the settings.liveudpate file from working machine to problamatic machines, all the liveupdate settings are stored here, this should fix the issue.
The location of the Settings.LiveUpdate file varies according to the operating system:
* For Windows 95/98: C:\Windows\All Users\Application Data\Symantec\LiveUpdate
* For Windows NT 4: C:\WinNT\\Profiles\All Users\Application Data\Symantec\LiveUpdate
* For Windows 2000 and XP: C:\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate
Note: You must delete the S32luhl1.dll file before deleting the Settings.LiveUpdate file.