Latest Xbox Games

I need some help with my 360 I have done a trade with my brother I traded my dsi for his xbox 360 plus some games so the deal turned out good and the when i turned on my 360 it was working fine so I decided to play a game and i popped in “Infinite undiscovery” I played the game for about 34 minutes (Because your able to pause the game and see how long you’ve been playing it) And the 360 was working fine i wasn’t expecting this to happen So after i was done with infinte undiscovery I decided to play a different game Condemned The first one not the second one.. anyways I had to start a new game because my gamer profile was deleted so after i did the crime scene thing And about ten minutes later i killed my first enemy Yay Then about a few more minutes later when it just tells you how to kick I met another enemy and i was in a little room with some lights come through the windows so i tried to kill the guy but for some reason his A.I. Was Very high and he was hard to hit Because i was only able to use the handgun at the time So i was just hitting with the handgun i hit him once and his weapon flew out of his hand i tried to hit him again but he keep grabbing me So much until i died so then it was at the loading screen and i noticed that it froze so i thought it was the disc so I turned off the 360 useing the console button then turned it back on and it was taking forever to start up so i reset it again about 2 more times and then i waited about 15 minutes and then i see the most horrible thing the three rings of death I never new that would happen to this 360 i thought we had a good model because we had it for about 3 years this happened about a week ago and i really need to fix my 360 all i have now is a normal xbox and it’s hard to find games for it so i want to know if theres any free and easy way to fix my xbox 360 I’m glad you had the time to read all of this Thanks