I have read through some of the discussions and have found that the "Accessibility" feature is turned on either through Windows Speech Recognition or Dragon and the only way I have found to disable this is to rename the API's - Accessibility.api, ReadOutLoud.api - typically found in C:\Program Files (x86)\Adobe\Acrobat 9.0\Acrobat\plug_ins. You will then be prompted with a comment box, simply apply check to box to never remind you again. DO THIS ONLY if you don't need these features.
North America
Europe, Middle East and Africa
Asia Pacific