Yahoo messenger. When i install the new messenger it gives me an error first it says Download of

Question

When i install the new messenger it gives me an error first it says Download of file has been canceled or interrupted 404 not found. then it says the file c:\documents and settings\casey peck\local settings\temp\73056671ytb_inst.exp could not be opened.and then i cannot sign in to yahoo. please help if you can.thank you very much