Vista Backup Folder Delete

I am running Windows Vista 64x and the C drive is almost completely full. I was trying to remove folders to free up space on it and have a folder named BACKUP. It is currently titled in blue, along with the subfolders. There is about 11G being used in this folder.

I have browsed through the forums and have found a lot of good information that seems to have worked for a lot of people, but every time I've tried to follow the same procedures, I keep coming up short. The last forum topic I followed the guidance on was at "topic85514" here. After going through all the steps listed there, I again attempted to delete the folder but I keep getting a warning box that says, "You need permission to perform this action." And that the destination folder access is denied.

I don't know what else to do with this, or how I can get the appropriate permission for this. To go along with this, I do have access to the "hidden" Vista administrator account as well, and have made sure that the admin profile has full control over the folder, sub-folders, and all items contained therein.

Any help with this would be immensely appreciated. Thanks.
 
I already took ownership of the entire folder and subcontents. Still running into this problem. I've turned off UAC, tried to delete from Safe Mode, everything that I can think of, but no luck.
 
Still nothing. It says that there is nothing to unlock. When I choose the option to delete the file, it fills my recycle bin, but the files are still there in the original folder. So it has basically done nothing.
 
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