Itunes could not connect to itunes store..

i have a ipod classic and rarely have any problems with it, my boyfriend got the itouch n downloaded itunes to my laptop and since he has done this mine & his itune will not work.. it says 'itunes could not connect to the itunes store..make sure your internet connection is active and try again'??? any ideas what went wrong.. in need of some help as go on holiday in 3weeks and want some new music

thanks