That did the trick. Acrobat had created 66,000 temp files for me. Yay.
While searching, I also came across this page that suggests moving all of your Acrobat plugins to an "optional" folder so it launches faster. Yay again!
Of course, this only helps you if you're running Acrobat 6. I refuse to upgrade. I wish I was still running 5. That version seemed to work much better. Are there free (and better*) alternatives to Acrobat Reader on Windows?
* This rules out Ghostview I'm afraid.