Xbox live and new update..

m.oxm.co.uk/.../xbox-live-update-whats-new-this-week

Xbox Live engineers are working to resolve this issue and will update us as new information comes available. Check here for any new updates -
support.xbox.com/.../xbox-live-status

Yeah this is happening to a lot of players. It's just a matter of time now and all we can do is wait until Microsoft hears of this issue and fixes it.

Hello,

You will need to first gain access to the parental account in order for you to be able to successfully agree to the terms and conditions. You won't be able to change the parental e-mail without being able to login to the prior e-mail that's listed.

Since you're 21 now you should be able to promote your account from a child to an adult after you're able to agree to the updated terms on the parental account. You should be able to do so by following the directions
here.

The parent must agree to the new terms first and then you can login to your own account and accept them. If you don't have access to the parental account you will need to try to reset the password found here.
If that doesn't work try to fill out the Microsoft Account Recovery form found here.

If you're unable to either of those things then you may be out of luck. You can try to contact phone support and see if they are able to assist you in
some way.

Further information in regards to the new terms of service agreement update can be found here.

Did you update to the new My XBOX Live, or did you install just an update for MW3?