Name that appears when sending an email.

I recently had someone tell me that my name doesn't come up when they type in my name to send me an email. It is some other name. How do I change that in window live hotmail?

For example, if someone sends me an email instead of it saying my name it says something like "theworstnameever"

I want that changed. And I can't figure out how to do it.

Thanks.