Question about Outlook Express

Hello,  When I try to log in to GFW marketplace I get the following error message:  There is a problem with your account that you need to resolve before signing in. Code: 80154002.  I've cleared my cache and restarted my computer. I've tried changing my password and using several different emails to generate new accounts. None work, however. I don't have access to any other computers other than Macs.  I've exhausted the forums here and haven't found any solutions at all.  Please help.