Getting TExaS help system running on Vista
The link for the update from Microsoft's website so that TExaS help system works on Vista is shown below.
http://www.microsoft.com/downloads/details.aspx?familyid=6ebcfad9-d3f5-4365-8070-334cd175d4bb&displaylang=en

Open it in Internet Explorer ONLY; also choose:
Windows6.0-KB917607-x86.msu version for 32 bit Vista and
Windows6.0-KB917607-x64.msu for 64 bit Vista
Install it and the help system for TExaS or any other program designed for earlier versions of Windows OS would work fine on Vista.