I was putting JMyron on a new machine, to use in Processing on Windows 8, and kept getting this:
Exception in thread "Animation Thread" java.lang.UnsatisfiedLinkError: C:\Program Files\processing-1.0.4\libraries\JMyron\library\JMyron.dll: Can't find dependent libraries at java.lang.ClassLoader$NativeLibrary.load(Native Method)
Well, I used Process Monitor to see what was going on, and spotted a load of failed attempts to open MSVCP71.dll during sketch startup. I tracked down a copy of that C library (msvcp71.dll and msvcr.dll), dropped them into my system32 dir and hay bingo, works. Process monitor is ace.
I had already installed the C++ 2010 redist. I guess JMyron needs some extra sugar.