Go to c:\Program Files\Micro Technology Unlimited\Hoster folder and delete contents (unless you have your song files in the Songs folder then don't delete that folder).
Next go to registry and find HKey_Local_Machine\Software\Micro Technology Unlimited\Hoster and delete that key. Here is the instructions on how to do this.
http://www.mtu.com/kb/index.php?acti...7cbdf94a54101f
Then you should be able to re-install.