Browsing the Internet and running Java applications can be very demanding on your machine. In addition, if you have been running your machine for an extended period of time, certain applications may not have "cleaned up" after themselves, causing memory or disk space to be used up unnecessarily.

If you have been able to play the games in the past and are experiencing problems intermittently, try closing all browser windows that are currently open. If that doesn’t help, try rebooting your machine.