Duh... I didn't check your post too, I'm sorry.
But NEVER copy files yourself in the "C:\WINDOWS\system32"!
This can lead you to DLL HELL, if your application is linked with a lib's version which is not binary compatible with the one you have, you'll run into strange bugs.
Windows look in 2 positions when looking for a dll:
_ first, the directory of the executable file
_ second, all directories in %PATH%
I recommend you to put dll with your exe file, this is the easier and the less error-prone solution.
If you are compiling many wxwidgets applications, just add the dll directory in the path. The day you will want to remove wxWidgets, you won't have to search in windows to remove the files you added many months (or years, if windows is stable enough
) ago.