hmm, if you can't trash cookies, that is most odd.
You can do it manually, Go to 'start' then 'search' and search all files for 'cookies'
You might find several folders with cookies in - choose the one that correspond to the computer username you normally used. Then open the folder, and delete any cookies in there called ybw - there might be more than one. like ybw(2) etc
Other than that, hit the notify moderator button and see if Paul Lomax has any insight