On a stock Window Vista, Windows 7 or Windows 8 computer, attempts to access the built-in help system in SOS modules will result in an error message, stating that your current version of Windows does not support the program’s help system. The needed help system software is available on the Microsoft Downloads site, from which you can download and install the missing component.
The following page on the web contains links to the correct WinHlp32 installer for all of the current versions of Windows, including Vista, Windows 7, and Windows 8:
http://www.microsoft.com/en-us/download/search.aspx?q=WinHlp32.exe
