I helped a user update his Acrobat Pro 9 to 9.1. The installation was not successful initially using the Adobe Updater. I then downloaded the update manually from Adobe’s web site and finished the update process. Everything seems to be running fine except the ability to capture web pages as PDF files. Whenever the user click on the Convert or Select button on IE, the dialog “Could not access Acrobat’s Web Capture facility. Acrobat may be busy or waiting for input.” pops up and the PDF file is not generated.
To fix this problem, click on Help -> Repair Acrobat Installation and reboot the machine after the repair process is finished.