I have been using Internet Explorer 8 well for some time but I am now having repeated difficulty with Adobe Reader 9.3 because PDF's continually freeze or hang up while I am in the browser -- forcing me to close the browser completely.
Incidentally, Resetting IE 8 to its Default settings did not help to prevent the browser from still freezing while trying to read PDF's.
The only way I solved this problem is to uninstall Adobe Reader 9.3 completely, Restart the computer, and then install Adobe Reader 8.2.0 . Now, I have absolutely no difficulty with PDF's freezing or hanging up.
Adobe has simply to debug Reader 9.3 in order to make it more compatible with IE 8 and Vista.....