Files acting strangely in Incomplete Folder

[arr1234]

I deleted all of the files in my incomplete folder using Limewire, and, when I look in the Library tab, it says that nothing is in the incomplete folder. But there are a couple files there, and when I try to delete them, Windows makes the error beep sound, and when I try to look at their properties, it says that "Properties cannot be accessed for this item." I can't rename or move them either -- but explorer says that they still account to some size on my HD. I was wondering what these files were, if they ACTUALLY take up space on my HD, and how I could remove them?
Thanks in advance.