Norton Internet Security installation problems...need HELP!

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I've just purchased Norton Internet Security 2007 and cannot get it to install. Before I purchased the product, I downloaded the trialware. When my CDs (SystemWorks also) came in, I uninstalled the trialware (at least I thought I did) and installed SystemWorks Basic. Then when I tried to install Internet Security, it keeps giving me a message that says "LiveUpdate or Automatic LiveUpdate is running...please disable or wait until complete"...something to that effect. I've waited hours and I keep getting the same message. I've tried to disconnect it, but there is no option to do that since Internet Security is not yet installed. I did a search on Symantec's web site and it said to disable the LuCom~1.exe file from the TaskManager. Tried that, but since it's a system file..."Access Denied". I'm at my wits end. I do not want to spend another $40 to call a technician and have exhausted just about every idea I've come up with including "trying" to uninstall both products and start over...can't do that either because of LiveUpdate. Any suggestions or help is greatly appreciated.