camelNotation 1 Posting Whiz in Training

Hi.I'm using msn messenger 6.1 and internet explorer 5 possibly.I recently have changed my hotmail password but after that,I have'nt been able to sign in many times.Why ?I have tried all the possible typing mistakes I could make.Is there something like the hotmail password change needs time to get detected by messenger ?My windows messenger 5.0 is saying that messenger hasn't been able to detect a default browser.But I only use internet explorer.