In VS 2005, go to Project | Add Reference..., click on the COM tab, and add
the Adobe Acrobat 8.0 Type Library to your project.
You can try something like this...
Acrobat.AcroPDDoc acrobatPDF = new AcroPDDoc();
acrobatPDF.Open("C:\\temp\\somedoc.pdf");
acrobatPDF.Save(nType, "C:\\temp\\somedoc.jpg");
[Sorry. Can't for the life of me remember what nType should be for JPG, or
even if it's supported]
And no, if you get a bunch of Interop COM Exceptions I can't help you.
That's far too much of a can of worms for me to go near.
The best place to look for help regarding working with the Acrobat API is
the forums at
WWW.PDFPlanet.com.