I've had Norton 360 on this machine for 2 1/2 years - no problem prior to this.  It is v5.1.0.29.  It has always updated properly prior to this.  I have scanned from online scanner, done everything support has offered.  When I go into liveupdate it says it is downloading updates, processing updates, then "to receive most current updates you must restart your system".  I've downloaded and restarted at least 10 times.  There are 6 updates starting with "Norton 2011 iron revocation list" to "Norton Pulse Updates".  I'm just not getting anywhere.