Hello my xbox live account has been hacked,I have no way of getting the account back myself because the person changed the email and gamertag. The old gamertag is DarkenedParadox but I don't know the new one. Thank you and any help would be great.;
You were not hacked, but phished. The user tempted you into giving him your email, password etc.
You need to call 1800-4My-Xbox to have an unauthorized investigation on the account. Be patient, the investigation could take awhile, from up to 30 days or more sometimes.
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I think someone else that used my computer installed a program and it was infected with a keylogger.
Perhaps you wouldn't have to worry about getting 'hacked' if you didn't participate in modded lobbies. A quick Google search shows you asking for one in June 2010 on a well known modding website.
Contact support and have them begin an Unauthorized Access Investigation. 1-800-4MY-XBOX if you live in the US/Canada.
Call phone support in your region (support.xbox.com/.../contact-us.aspx), file an Unauthorized Access Claim, and wait for the investigation to close.