If the uninstall doesn't work, you will probably have to replace the files. Theres nothing i can do about that, its a problem with SMF.
The files you need to replace would be
Basically whatever the uninstaller failes on, you need to replace the files.
If you are getting adds multiple times per page, that means that the edits exist too many times. Look in the theme board to see what edits are done, so that you can take out the repeating ones..
I can do a script for Musiconica theme, however you will have to give me some time. School is starting to pick up now, and i have a back log of work to do. Sorry.
do we need to uninstall it first before we replaced those files that you mentioned?
also, on which folder should I look for the files that you mentioned? on the root of my smf or on the theme that I'm using?
I'm not a programmer, please excuse my ignorance..