If you're trying to install Mixcraft and you get an error that a procedure entry point could not be located in the dynamic link library, try quitting the installer, then deleting the DLL file that is mentioned at the end of the error from Mixcraft's folder. For example, if the file is called "acuutils.dll," you'd delete it from this location:

C:\Program Files\Acoustica Mixcraft 4\acuutils.dll