it's because you registered your email account to your computer
user account.
The only real way is to remove your saved Passport. To do so, click
the
Start Button, then click the Control Panel. Then, click User
Accounts in
the Control Panel. Select the Windows account name in question, and
then
on the left side of the screen, under Related Tasks, click 'Manage
my
Network Passwords'. In the window that opens, click the
Passport.Net\*
(Passport) entry and click 'Remove'
