Hi aggrevated1,
Welcome to the Norton Community.
In addition to the extra information that Dick requested, there is one thing you can do to at least limit the size of a FULL definition download.
Please ONLY do this if you were not subsequently able to complete the live update.
From the main NAV window, click on Settings and it should bring up the Computer Settings page, if not click on that.
If you turn Smart Definitions ON it will limit the amount of data that you have to download when NAV is wanting to download the FULL set of definitions.
Before you decide to do this, let me explain what Smart Definitions are so that you can make an informed choice. With this option turned ON NAV will only download the CORE set of definitions which does not include definitions for older malware which has not been seen quite some time. If some old malware did start being propagated again you would still receive updates related to that malware.
From the NAV Help information it says:
Norton Internet Security provides the Smart
Definitions option to choose between the Core Set virus definitions and
Complete Set virus definitions for LiveUpdate sessions.
When Smart Definitions option is turned on,
Norton Internet Security activates the Core Set virus definitions which contain
the most important virus definitions that are required for latest security
threats as viewed by Symantec. Turning on the Smart
Definitions option minimizes download time, installation time, and system
start time. It also provides you free disk space of about 20-30MB. Therefore,
the Core Set results in faster performance of your computer.
When Smart Definitions option is turned off,
Norton Internet Security activates the Complete Set virus definitions which
contain all the virus definitions for each threat that is known to Symantec.
Please provide the exact version of NAV that you have. You can find this from Support > About. Also what version of Windows and SP (Service pack) you have and whether it is 32 or 64 bit.
Also, what error message if any do you receive when live update fails? When Live update is completed there is a "View Summary" link you can click which will give you more details about the updates it attempted and which ones failed vs succeeded. Additionally you can click on History then select Live Update from the drop down list. Please check this and let us know what was reported as part of the live update session. You can double click any of the events in history and get more detail on it.
This is in addition to what DIck has already requested.
Best wishes.
Allen