web page cannot be displayed

Hiya, I can get on my homepage, but over the last few weeks everytime i try to go on an address usually used in my favourites, it keeps saying it cannout be diplayed, the address is right, and xp diagnostics says no problems with my internet connection, and have been rebooting modem doesnt help, just have to keep refreshing sometimes it comes straight up other times i get same problem over and over, any ideas? Hayley

 

Thankyou, i am using internet explorer 7, i will give it a try.