How do I create a PDF from a scanner that is installed on my Mac but not recognized by Adobe?

I have recently downloaded a copy of Adobe Acrobat.  I would like to use my scanner to create PDF's through Adobe Acrobat.  The problem is that when I attempt to create a document within Acrobat, I cannot seem to chose the scanner, it is not available.  The scanner is an HP Photosmart 5510 and has been installed on this computer for years.  Please help.