If you are being prompted by Hotmail to enter letters before sending an email it's an indication that your account is sending too much email and may have been compromised.
Immediately change your password and the rest of these suggestion :
http://www.emailquestions.com/email-discussions/2714-someone-hacked-my-email-account.html
Immediately change your password and the rest of these suggestion :
http://www.emailquestions.com/email-discussions/2714-someone-hacked-my-email-account.html