Technically acrobat 7 not not designed for windows 7 OS. You can try to install the pdf printer manually but it's not guaranteed :
Click the Windows "Start" menu, select "Control Panel," choose "Hardware and Sound," click the "Add a Printer" link under Devices and Printers.
Click "Next" and select "Local Printer Attached to This Computer."
Remove the check from "Automatically Detect and Install My Plug and Play Printer" and click "Next."
Select "My Documents\\*.pdf (Adobe PDF)" in the port selection drop-down menu and click "Next."
Select the "Have Disk" option and click the "Browse" button to open a dialog box.
Select the "AdobePDF.inf" file located in the AdobePDF folder in your Program Files directory under "Adobe" | "Acrobat 9.0" | "Acrobat" | "Xtras."
Select the first item on the list of Adobe PDF Converter options and click "Next."
Type "Adobe PDF" in the field for a printer name and click "Next."
Wait for two minutes for the system to process the drivers and click "Finish" to close the Add a Printer wizard.
Hope this helps.
Moving this discussion to the Printing & Prepress sub-forum of the Acrobat forum.
The answer doesn't relate to what is on my PC - I havbe Acrobat 7.0 not 9.0 which is indicated in the answer.
In otrher words it is not possible to follow the path indicated in the answer.