If you are using @live the same thing applies, change the password and adjust the spam filtering options to be more strict, beyond that you can really only block what you know is bad and report it, it is not advisable to use the "opt out" option because then it tends to worsen, once you attempt to stop it via this method you have instead shown the account to be active. The other option would be to start using a client which would allow for better filtering with a third party program, many of which are free or built-in to the security suites often used, Avast for example. Beyond this welcome to the joys of web based emails, some are certainly better than others.