i have just seen the adds on telly selling Norton I S 2009 premier edition at half price £24.99 .plus you can use it on three pcs at once .my yearly subscrition is due in one month and that will cost me £45.99 for norton I S .my question is, is premier edition the same internet security version as i use and what will the normall anual cost be for the new version , is it the fact that you can use it on 3 different pcs, is this the only difference , thanks