find and d/l windows 7 take ownership reg file. this will add a take ownership entry to your right click context menu. Go to the folder and right mouse click on it and choose the take ownership entry from the menu. This should allow you to delete it.
I have no idea of what ZZZZZZZZZZZZZZ folder you are referring to, unless you simply misnamed it, but that shouldn't effect your ability to delete it, unless for some reason you don't have ownership of it, as the last post dealt with. The only other time I've found I couldn't delete a folder, is when it contained other files & folders. This is not always a problem, but when it is, I delete those internal files & folders first, then the root folder should delete also.