Using my no 1 computer, a registered account has been opened with slimmingworld.com. An acknowledgement email has been received confirming the registered details including the email address. Using my no 1 computer I can sign in to slimmingworld using a link on their website. However when I try to do the same thing on my no 2 computer it fails and the error message 'invalid email address' appears. Is there a setting on my no 2 computer needs changing? There are no problems with the normal use of emails sent and received via the hotmail inbox. Both computers run on the same LAN. No 1 has Win7 and no 2 has XP.