Woha! That's a very old setup to discuss about!
CVI 7.1 is the first release that incorporated the internet library: usually if a library is present and active (i.e. not grayed out) in Library menu you should have no problem in compiling and linking, but sometimes it happens that in the first releases some additional step is needed to have it work correctly. I cannot go back to 7.1 release here but in function or library documentation you should find whether additional items are to be configured in the IDE to have the system work (e.g. adding some library to the project or so).
