Hi, Have been playing Assassin's Creed II for about 3 weeks, about 1 week ago, I started getting "Game Error - This disc is unreadable" while playing it. I bought the game brand new and had no problems the first 2 weeks and had not even removed from my Xbox 360. I keep getting this error and have cleaned the disc several times. I see no dirt or scratches on the disc. Has anyone else experienced this before? I am about 1/2 done with the game, and don't want to stop as it does not happen constantly, but more and more frequently. Is this a defective disc or is something wrong with my Xbox CD-ROM? Any help would be appreciated. Thanks!