unable to delete messages

[elwyn]

when i try to delete messages from my inbox, messenger succesfully transfers to the "trash can". However, when i then try to delete permanantly from the trash can the messages wont delete. "error occured click here to resolve". when i click to resolve, a box appears with the words "do you want to permanantly delete these messages". when i click "yes" nothing happens and the mesages remain. pleeeeeeeeese help
thanks