If you are having problems setting up your Xbox 360, check out the support section of Xbox.com. There is a lot of new information up there specifically for Xbox 360 owners.
There is information on games, Hardware, Xbox Live and even step-by-step instructions on how to set up your Windows XP computer to share Music and Pictures with your new Xbox 360.
In addition, here are instructions on setting up your Media Center PC to work with the Xbox 360.
Click here to go to Xbox 360 Support
Thanks and enjoy your Xbox 360!