The netViz Help file will not open in Windows 7 by default. You may receive an error, such as the following: THe following steps will resolve this issue for you.
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netViz
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Unable to load Windows Help file:
C:\Program Files\netViz\7\Pro\Program\netViz.hlp
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Windows 7 may display a "Why can't I get help from this program?" message. To access the Help file, you must first download the Windows Help program (WinHlp32.exe) referred to in this message.
After you install the WinHlp32.exe program from Microsoft, you are able to open the Help Topics, but you may receive an error similar to the following when launching context-sensitive help or performing other actions: ---------------------------
Windows Help
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There was a problem running the macro. (1037)
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To resolve this issue, perform the following steps, which will enable macros on a single computer: