As far as I know, AA 9 will probably work on Win8.1, though MS seems to be trying to make such things hard. You may likely have to install updates. As for the license, I have the same question as TSN. The blurring may simply be setting the display preferences for smoothing or it could be the specific PDF. Be sure to open a standard PDF (such as a download from Adobe -- like the manual for your version at Archive). I have also heard that many things in Win8.1 are an improvement and other things are apparently ticking a lot of users off. I am not a Win8.1 user, so I am only speculating. At this point, I think the first thing you need to do is open Acrobat and use Help>Updates and install updates until you are current. That may solve some of the problems. The display preferences may solve the rest (unless you are just looking at a bad PDF -- reason to look at the manual I suggested).
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