Vista - Can't stop sharing (Home Premium)

I was cleaning up my documents before doing a backup and found an old folder that belonged to my husband. Since he transferred this, it no longer needed to be on my machine so I tried to delete it. It wouldn't delete the folder because it said that it was shared. There is nothing to indicate this folder or any of the files in it are shared (no pictures of hands, etc. on the folder icon, etc.).

Anyway, I found out this is how he transferred the files but he no longer needs them on my machine. I tried to turn off sharing and it would not let me. When I chose "Stop Sharing," it said, "This may take a few minutes," then ran for a bit. Then it said, "You could not stop sharing the selected folder." There was a link underneath that said, "Click here for more information on why you could not stop sharing this folder." I clicked on the link and it said, "This folder is in a shared folder."

The folder it is in is my Documents folder, and I can delete any and all of my documents and any of the other folders. The reason makes no sense.

All I want to do is delete this folder. Any ideas? Thank you.