There are some instructions in a thread somewhere I could try to find, but IIRC those instructions were for MC4, so they probably don't apply any more.
If it were me, I'd just search the registry for "music creator" and "cakewalk" and delete those entries. But be careful and make sure you back up your registry before starting.
You might also consider contacting cake support, I know theycan walk you thu registry clean uninstalling.