address book?

Desktop no problem checking mail or sending mail
address book on O/E and yahoo ok
Laptop, address book ok in O/E
but when I open my yahoo mail @btinternet,com
no problem to read mail, but my address book just
shows a blank white page, and if I want to send mail
I have to type each address, a bit of a pain when sending to lots of address's how can I get my address contacts back into my mail, Thank you Bob..