NAV hangs during scan

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Norton Anti-virus (NIS 2007) has been hanging in the same place every time I try it (actually it hangs the whole computer).  It says it is scanning commonly infected areas and start-up files.  When it hangs, it says it is working on

 

HKEY LOCAL MACHINE\SOFTWARE\Classes\ http\shell\open\command

 

I was running the Windows task manager just to see what was going on and that hung too.

 

I would appreciate any ideas on how to get past this.  Thanks.

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