Someone keeps hacking into my email account and opened a Facebook account using my email. how do I stop this?

[Fred]

First download the free scanner from ttp://malwarebytes.org and run the full scan in case someone has pushed a keylogger onto your machine and is reading every keystroke, including banking and credit card details, user names and passwords. If it finds anything you need to sort out how you use your machine. You need a good, fully updated active anti-spyware/virus. you must NOT just blindly click links people send you or open email attachments unless you are absolutely sure of the content.
After this scan you need to change ALL your account passwords AND security questions and answers. All passwords need tp be at least 8 characters long. They must NEVER contain any part relating to you, friends, pets, family, cars, addresses, phone numbers or any of the other things you tell the whole world in chat or in person. They must include a mixture of upper case and lower case letters and some numbers. and use a different password on EVERY site.
Then NEVER answer questions to anyone who constantly asks you any of the above information. and never tell anyone how you make up our password. Your security questions should equally not relate truly to you.