Hello,
The service pack in question is not for Windows XP. The Measurement Studio installer required the VC++ 6 service pack 3 or higher. I know that Microsoft has a service pack 6 for Visual C++ 6, and this is what you should install to get the C++ libraries on your machine.
There is a tool on the CD that is in the ActiveXLicenseFixer folder that you can run to fix up the license. If you have a valid license on the machine it will correct any licenseing issues.
-Jeff
NI