Build a pacakage using the setup.exe file with the command line switch /s /v/qn (notice that there is NO space between the "v" and "/qn". This will silently install all the prerequitites and Proviewer)
Use Package Boot to build custom package.
Ensure you include the data1.cab, mapinfo proviewer 11.5.msi and setup.exe files.
Hope this helps - it only took me two days to work it out