Since you have update the printer driver for Brother MFC 7320 to the latest version, I think this is should be something wrong with your operating system, check Windows Update to see is there any available update and then you should update Windows firmware as well. If necessary, check for updates for the Acrobat 9, such as driver and software, and you may need to install those updates and reboot your computer.
Brother 7320 scanning problem
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Since you have update the printer driver for Brother MFC 7320 to the latest version, I think this is should be something wrong with your operating system, check Windows Update to see is there any available update and then you should update Windows firmware as well. If necessary, check for updates for the Acrobat 9, such as driver and software, and you may need to install those updates and reboot your computer.
http://www.driverchecker.com/search/search_driver.php?select=Print&driver=Brother%20MFC&newpage=1