I have a G73JW-A1 and I too am having a problem with the Asus Live Update hanging and not completing the downloads. Yes, I know that I can download and install them manually, but it's a pita to do each one individually.
Here's what I found about the Asus Live Update on the asus website is that the antivirus and "system monitoring agent" should be turned off before clicking "Ok" and starting the update. I know how to turn off the antivirus, but I have no idea what the "system monitoring agent" is, what it is called, how to find it, etc., much less how to turn it off.
Here's a link to where I found the information:
http://support.asus.com/troubleshooting/troubleshooting.aspx?SLanguage=en-usIf someone could kindly tell me how to turn off the system monitoring agent I'd be so very thankful.