How to uninstall Replay Music application completely from computer,even from registry

Hello users,

Please ignore and redirect if this question is not to be posted here. Here it comes...

I have a registered version of a software that expired recently. I wanted to try their new upgraded trial version, but for some reason the previous version's settings and components stayed intact on my computer. I ran the application's uninstall and also uninstalled it from "Add or Remove Programs" section, but the moment I run the new upgraded version, it loads up with the older version's settings like (the save directory and "Expired" registration code etc). Is there any way I could "completely" remove it from the computer. Not even a trace of it. I think the normal "uninstall" will not completely take care of the computer registry entry! Please help me.