Try the following:
1. After making certain you have a copy of your Product Key for Norton 360,
uninstall all Norton software (including LiveUpdate) via Add/Remove
Programs.
2. Enable the Windows Firewall.
NB: You're "working without a net" now: Don't to ANYTHING else online (e.g.,
browsing; reading email; chatting) except #3 through #5 below until your
anti-virus application has been installed and fully updated!
3. Run this removal tool:
http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039
4. Reboot and /immediately/ reinstall Norton 360.
5a. Reboot again, then run LiveUpdate manually and repeatedly until you get
a "No more updates available" prompt.
5b. Run a full system scan with Norton AntiVirus.
Do your problems persist now?
--
~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Desktop Experience - since 2002
AumHa VSOP & Admin http://aumha.net
DTS-L http://dts-l.net/
You asked for assistance. Feel free to ignore my suggestion.
Norton applications do NOT uninstall cleanly. You MUST run the Norton
Removal Tool after uninstalling the Norton application, any Norton Add-ons,
and LiveUpdate via Add/Remove Programs (Installed Programs in Vista).
How could Norton be involved here? Because you'd upgraded from another
(expired & free-trial) version Norton application without cleanly removing
the latter first.
However, the fact that your computer had no anti-virus protection for a week
or more (since the first Norton application wasn't running with updated
definitions) may be in play here, too.