I bought a used xbox 360, but they has with parental control activated and cannot play...

Hello alejandrocontreras6,

Thank you for posting on the Xbox forums. We understand that you purchased an Xbox 360 that has an active parental pass code. We suggest utilizing the article entitled, "How
to reset the pass code for parental controls on Xbox 360" in order to resolve this issue. Be sure to let us know the results!

Hi there! I am afraid that the Family Packs are no longer available. However, when his account is created it should still prompt for a Parental Account so that you can have controls and monitoring for his account's activity. That info is over here: Xbox
360 Parental Controls | Xbox LIVE Parental Controls

I bought a preowned Xbox 360 with parental controls so I can't play 75 percent of my favorite games

Is there is "maintenance" ongoing with the Microsoft store / Xbox marketplace. I was on the phone for almost two hours before I was told this, and I am concerned that this was said in order to end the call, "

Parental settings has no bearing on dvd games

And fyi

You cannot purchase Unrated Indie games with child accounts and yes they are treated seperately

Will parental controls affect access to my Indie Game?

Yes. All Xbox LIVE Indie Games are considered unrated. Unrated is the highest level of restriction on the Xbox 360 console. Indie Games will be inaccessible on consoles with activated parental controls

5) If the children have anything but Adult settings on the account, they will be promted with either a passcode , or a warning that the game cannot be played. Easily changed from the dashboard of course.

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support.xbox.com/.../xbox-live-parental-control

Have fun!