Does it work in other browsers?

I don't know under what circumstances Hotmail would ask for a phone number. Perhaps there was some suspicious activity on your account.

Hotmail ask my phone number.I fill number in blank.but it show message that they cannot found my number.I try to login my account by IE7.it work

it not work on firefox opera and google chrome.

That is probably for recovery in case of problems: A password isn't enough

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.org/kb/Safe+Mode

Thank you cor-el.I did after your suggestions.but it not work

Did you try not to make any changes on that "A password isn't enough" page, but just click the button to save and continue?