For Links 2004, Amped, Amped II, and Top Spin point your browser to Xbox.com’s Support page, where you’ll find solutions for individual game issues or Xbox hardware problems, and assistance with Xbox Live.
Xbox.com Support Page
For Links 2003 and previous versions of Links head on over to the Links Country Club.
Links Country Club
If you still can’t find a solution, fire an email to firstname.lastname@example.org