Don't remember password/can't reset password.

You could try and call Xbox Support and maybe they can help you out

I'm sorry but I think you're out of luck until you can remember the password or get it reset by answering the necessary security questions.  

After all, it wouldn't make much sense to secure your account with a password if there was a way to bypass that security without one.

Xbox support cannot resets passwords . Also if you know the windows live ID it's real simple press forgot password

When presented with 3 options password reset email or secret question or secret answer and other options

Select other options

This will take you to the windows live iD validation form which you have to accurately answer questions about your account to prove ownership as long as you are the owner and didn't put random info then you should pass .

And I would suggest setting up reset proccess cause you do have slot of options for password resets if you set them up. KeepIng your windows live id and contact info upto date is a good idea it's like your drivers license for live