1.Do you get any exact error message while loading the game? If yes, please let me know the exact error code.
2.What is make and model of your computer?
3.Which games are you not able to play on your system?
4.Were you able to play the games on your system in past? If so, when did the problem start and have you made any hardware or software changes recently?
5.Are you talking about the online games or the games which are installed in your system?
If the problems are with online games, update your flash player. Click on the link given below to update it: