How to connecting to HP ENVY 7640 with 9 PRO

Hi,

I just purchased an HP ENVY 7640 printer/scanner. I currently have Acrobat 9 PRO installed on my iMac.

When I go to File / Create File / From Scanner, under the Input / Scanner field (Please select a device), there is no selection for the ENVY 7640 printer/Scanner.

How do I setup 9 PRO to select ENVY 7640?

I have just re-installed 9 PRO but still unable to select ENVY 7640. I does not appear in the selection list.

Thanks.

Marc