www.xbox-scene.com forums - "Have you forgotten your parental lock code?"
Turn off your 360 Unit
Remove all memory devices
restart 360 Unit
go to system blade > Console Settings > System Info
left trigger, right trigger, x, y, left bumper, right bumper, up, left bumper, left bumper, x.
This should bring up a menu
Reset System Settings
Resetting your system settings
will return all console settings to
factory defaults. Do you want to
reset to factory defaults?
Yes, reset settings
No, don't reset settings
select to reset settings
your screen should go blank for about 2 seconds
then the language blade should appear that lists several different languages,
select your preferred language
then a blade that says "Xbox 360 Storage Device" should appear
With the options of,
Continue without one
select to Continue without a profile
Then an Initial Setup Complete screen should appear
with the options of,
High Definition Settings
select Xbox Dashboard
Now turn the system off, insert the Memory Unit or Hard Drive, and turn the system back on.
No more Parental Control lock.