Turn this off -> http://www.google.com/search?hl=en&q=disable+thumbs.db
Now delete all the thumbs.db and then if you want, turn on the caching again.
Hope it helps,
I've deleted & emptied my recycle bin of folders I no longer what numerous times on my computer only to have them magically reappear in my pictures folders weeks later. I haven't changed any settings on the computer and have never had this happen with anything other thatn pictures. Can anyone help sort this out?