If you're using Helicon ISAPI Rewrite, you do not need to install any other URL rewrite software. KMP works with this module from the box.
If you're already using IIRF (Ionic ISAPI Rewrite), you can just add necessary configuration according to the guide for IIS6 (it also works for IIS7).
If you're already using some other URL Rewrite tool, we strongly recommend to completely uninstall it, because it may interfere with native URL Rewriting module for IIS7 and it is most likely that URL rewriting will not work correctly, and KMP may be inaccessible even if you follow the instructions in this article carefully.