Outlook Windows XP and outlook 2007

[Moondust]

Hi, im running on windows xp and have recently installed office 2007, i've also changed my ISP to sky and they have recently updated there e-mail with google. The problem im having is the dreaded "enter network password" everytime i try and logon to outlook! I can axcess my mail via sky web-mail so the passwords are fine but no go with outlook! Im not sure if ive posted this in the right place but any sort of help would be greatly appreciated... Thanks