Hi Jan,
it's been a while since I last used Visual Studio, so I can't give you specific hints right now. You should basically create a project for libtins, include all of the header and source files and compile it as a library, indicating that you want it to be linked to libpcap(this whould be WinPCAP, since it's Windows). Once you've done that, you should be able to create another project for your application and indicate VS to use the dll that was generated in the previous step.
Anyway, if I have some time, I'm going to try to compile it using Visual Studio and give you some feedback.
Cheers,
Matias