I have 32-bit Vista Ultimate and Acrobat 8.1.2 - no PDF printer. The method described in this thread did not work for me. But here's what did work.
* Open Control Panel, select Printers
* Click Add a Printer
* Click Add a local printer
* Select Use an existing port (should be preselected), change the port to "Desktop \*.pdf (Adobe PDF Port), click Next
* On the next page, click Have Disk...
* Click Browse and browse to C:\Program Files\Adobe\Acrobat 8.0\Acrobat\Xtras\AdobePDF (or wherever you have Acrobat installed), click OK.
* It should now show a series of "Adobe PDF Converter" entries. Select the first one and click Next
* Change the printer name if desired, uncheck the box to use it as a default printer, click Next
* Do not print a test page, click Finish
* Find your new printer in Printers. Right click on it and select Properties, Advanced
* Click "Print directly to the printer", click OK
You're in business.