DIFFICULTY SIGNING IN TO WINDOWS LIVE MOVIE MAKER

 I tried without any success to log into my Movie Maker in a bid to upload a You Tube video. Using my Microsoft Windows Live account details, I was promted to change my password several times as each successive change yielded no helpful outcome. This hasn't happened in the past. I have tried both my email address, and user name to no avail. I can log into my email account, but not Windows Live which makes no sense at all. What could the matter be and how do I go about solving this problem? I am running out of new passwords and really can't afford to keep changing my password to keep up. Using the Movie Maker was never an issue when it came to uploading videos online. Why can't it recognize my username and password?