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If you did not change your password, you cannot log in, and when you try to change your password, the security questions are unfamiliar and/or incorrect; your account may have been compromised by a hacker.
Compromised accounts are at an all time high due to viruses and low complexity password which can be easily guessed by the hacker.
I will list a view different options you can take to recover your account.
Try to reset the password using the link, click on forgot password and attempt to reset.
If you have setup a mobile phone number of the account you can try to a access code sent to your phone.
If the reset options do not work then you will have to fill out the Windows Live Account Recovery Form. This is the only alternative solution offered by Microsoft for a free account. Since there is no billing info on the account they unable to validate your identity over the phone and do not offer Live Support. The form will require you to give them a contact email. This will be a secondary email you have access to, Microsoft will then send you a reply about your account to the contact email. If you don’t here is a link to open a free Gmail account.
http://mail.google.com For the recovery form, click here>>>http://bit.ly/gSxotJ Make sure to fill out as much information on the form as you can. The billing section is left blank since it’s a free account.
It will take a few days to process your form. However you will receive a response and if you provide enough detailed information you should recover the account. Once you have submitted the form you will be provided a PIN and website. The PIN is for a temporary account on the Microsoft private forum site. It allows you to discuss the account in question with their support team. You can ask questions about the account and check the status of the questions and form. It’s a support ticket through their Windows Live Solution Center.
Once they have reviewed the form they then send you instructions on how to regain access to the account to the alternate email you provided on the form.