Security POP UP NEWS GROUP LOG IN

I'm new to Vista. Just transfered to new PC.

I've set up accessing free.terranews.com as I had it under XP but can't LOG
IN.

I get a POP UP indicating that it came from Windows Security and asking me
to VERIFY my user name and password.

When I do, I get the same pop up.

Is this a known problem? Any work around available?

Thanks

Bill