if you are unable to log on to some of the web pages mean that you have not registered your name of that web pages where you are unable to login.
So, i request you please first try to Sign Up or register yourself and then confirm your mail and then try to relo in.
I hope this time successfully logged in.
try the best. best of luck.
PRINCE, June 2009
Look for that if you have any popup blocker that is further blocking you to reach to another page or else It might be that you have misplaced your user name and password as a first move try to confirm that...