How Do I get my SONIC2 TO WORK and other games
 

I bought 5 games from someone and 3 of them dont work, those are: Sonic2, Capcom SNK, Crazy Taxi2, these are relatively new games so maybe thats why they don't work, just a thought...can anyone tell me how I could get this to work? Like make them CDImage again and burn it some other way or something? HOW HOW HOW? please help, thanks...