I am trying to print an existing file to PDF programmatically in Visual Basic 2008.
Our current relevant assets are: Visual Studio 2008 Professional Adobe Acrobat Pr
PDFforge offers PDFCreator. It will create PDFs from any program that is able to print, even existing programs. Note that it's based on GhostScript, so maybe not a good fit to your Acrobat license.
Have you looked into Adobe Distiller Server ? You can generate PostScript files using any printer driver and have it translated into PDF. (Actually, PDFCreator does a similar thing.)