Originally Posted by Apoklepz
I've come across this and it's very irritating...
Try deleting it through your PC via USB but first go to the folder's properties and make it non-readable and non-hidden...You should be able to delete it.
If that doesn't work, try deleting it through the PSP's XMB or through any homebrew application organizer you might have...
If all that fails, I'm sorry but it looks like you're gonna have to back up your entire Memory stick to your PC desktop and have the PSP reformat it...works every time.