I have just upgraded to a new windows 7 64bit machine and have been having a few problems logging into some websites with Internet Explorer 8.
Basically what happens is that at the login page a new window appears with the title "Windows Security" and the message "The server at (server name) requires a username and password". I duly enter my username and password for the site and it is deemed incorrect even though I know it to be correct and can log in just fine with Firefox.
One of the sites is 123-Reg. I tried multiple times and was on the verge of phoning their support line when suddenly I thought of not ticking the box to remember the credentials. Amazingly it then worked and, even more amazingly when I checked in again later it actually had remembered my login.
The other sites I have had problems with are those with cPanel logins. In this case the same Windows Security login box appears and my login details are refused. The dialogue then changes to cPanel's own login box where I enter exactly the same details which are immediately accepted.
I would be very grateful for any insite into this strange behaviour and if it is possible to do anything about it. I would also like to know if it is possible to turn off the Windows Security style login and revert back to the more traditional one as per XP.