Normally, WindowsXP will prompt you 10 times that You Need a Passport to use WindowsXP Internet communication features...
To disable this
  1. Start Regedit
  2. Go to HKEY_CURRENT_USER \ Software \ Microsoft \ MessengerService
  3. Edit the binary key PassportBalloon
  4. Give it a value of 0A (0A 00 00 00)