Acrobat 9.?.?, Windows XP, Vista, 7 (32-bit, 64-bit), Service Pack ?, MSIE??, Outlook version number?? if being used for email as well. We need more details in order to help. Any changes to your computer recently?
BTW, you need to be using Acrobat not Reader, so perhaps you should re-post the details in a new thread in the Acrobat forum. Please let us know if you have Reader and Acrobat on the same machine and if so what versions.
Sorry for not providing enough information. I am running windows 7 Professional (64), Service Pack 1. Internet Explorer 9.0.1. Outlook 2007 is on my computer but I do not use it. This feature has not worked for quite a while and I'm not sure when it quick working.
I have both Acrobat 9 Pro and Adobe Reader X on my system.