Windows Live Mail not accepting my password

I've researched all the help sites, but still can't fix this problem. I recently changed the password on one of my live.com accounts. Now Live Mail won't recognise the correct password (I've done all the suggestions many times, deleted, re-installed, made new password, etc.) It keeps asking me for my password, or if I make it my default account, it says it's wrong. the dialog error box is always blank. the Action dialog box says the action is cancelled. I have no problem accessing the email account on a web browser or on my mobile. but I've always used Windows Live Mail to organised myself. I've check this forum thoroughly & still haven't been able to resolve the problem. any other ideas? I'm using Windows 7 Pro.