Other than Acrobat Distiller (part of the full Acrobat software, there are a
few free/cheap/share programs that will set up a virtual printer to which
you can "print" any file and save it as a pdf.
You can save it as an adobe file, however, I have noticed
that text gets skewed - this, from what adobe told me is a
microsoft issue - they reccommend saving as a jpeg or tif
and then opening acrobat and choosing the open file as pdf
command from the file menu to create the file from the pix