I got a call that Internet Explorer kept crashing when trying to click on a link. I suggested upgrading to Acrobat 9. That did not help. I did a site visit and got nowhere fast. I tried doing IE reset, deleting temp IE files and deleting temp files. No diff of course. To be less vague the insurance company had links to pdf files. I could save them and open them but when I would click on them in IE to view in IE it would crash IE. I gave up. A few weeks later another user at another account complains of the same thing. I went to Control Panel/Add Remove and removed the Acrobat reader. I went to Adobe and found Reader 7.x which installed fine and worked fine. No more IE crashes. I did not tempt fate by installing newer versions of Acrobat Reader. I will save that for another day.
Lately I can only find some version 8 which still works better than version 9.