Just to add an extra bit of info. Adobe are now giving away CS2 for free. That has Acrobat 8 pro in it, and when I installed it on someone's machine at work it said "Install Autocad Drivers"
Careful with that. The official Adobe stance is that is *only* to support activation for users who have previously purchased a license. While they are unlikely to legally go after "oh goody, FREE!" downloaders at this point it would probably be best to respect the intentions if not the technical implementation.