Whenever posting questions on these forums, please give us as much information about the computer as possible. The operating system and anything else you think might help is always of assistance. The more information you give us, the better informed our response will be.

In the meantime...

Are you saying that you have a previous version of Norton on the machine? If not, then there won't be any "LiveUpdate" on the machine. You you do have a previous version, then you should be able to uninstall it correctly using the links below:

How to uninstall Norton AntiVirus 2002/2003

How To Completely Remove Norton AntiVirus 2004 and Then Reinstall the Program

Hope this helps.