No Transport provider

[Bala]

I am using outlook 2000 in corporate/worgroup mode. Have
two profiles one for exchange and one for Internet Email.
When I use Internet email and connect to a pop3 server it
is not prompting for user name/password (Remember password
is unchecked). When I click send/receive, send/receive
logo dialog shows up and closes, no errors. When I try to
send out a test message, a NDR comes back with No
transport Provider available to send out mail. Recreated
the profile several times, disabled antivirus for email
scan, updated latest office updates, nothing works out.

Thanks,

Bala.