Disc failing to authenticate

[ThunderStorm]

Hey guys! I just have a few questions! I hope that this is the right area and if it is not i do apologies!

 

Anyways, I have had my xbox updated to the LT3. Now since then some of my games dont work on the xbox anymore, such as Assassins Creed Revelations, Skyrim and a few others, however some games do work... such as GRAW3 and Resident Evil 6. I burned Assassins Creed 3 onto a disc today and went to play it and it said "Failed to Authenticate Disc" halfway through the intro to the single player. Does anyone know a way to fix this? I'm very unsure, this also happened with Prototype 2 and I have no clue how I go about fixing this.

 

 

Any information on this is greatly appreciated! If anyone needs more information please just say!

 

Thank you

 

TS

[LIGHTNING UK!]

http://forum.imgburn.com/index.php?showtopic=12200