If you install the media player to the memory card it installs an OGG player in a sub directory. It is this sub directory that is stopping you from deleting the save, you must first delete all sub directories using MCLoader’s Memory card manager before deleting the save in the PS2 Browser.
Similary, when you install an application using MCLoader it generally resides in a sub directory, these also must be removed before deletion.
For a fast fix use the Xport software to delete the save and sub directories in one go
Posted in: PS2 Independence Exploit