I have those folders also and had the same experiences. I had another experience in deleting a folder, called RECYCLER, that is put up by a Trojan Horse called W32SPYBOT and also refused to delete. I learned that I could force a delete by right clicking on the Recycle Bin icon, choosing Properties, and turning off the features that cause a warning dialogue and that send a deleted folder to the Recycle Bin. With those off, I could delete RECYCLER (though it comes back). I don't intend to try it with xerox since I have no reason to think it's malicious but I thought the trick might be of interest. Of course you can turn the Recycle Bin back on again any time.
