Log out of the game and the Launch Pad, then reopen the Launch Pad and log in again.If the error occurs repeatedly, a full uninstall and reinstall of the game may be required.
Make sure you have enable Active X controls in your internet explorer that are required to run the Launcher properly to start the game.
Make sure you have Flash Installed if not, install it from here.
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DC Universe Online Troubleshooting Guide 1# Launch Pad Crashes – Troubleshooting Guide If you are facing issues running the game from the launcher or the game crashes when you run the game via Launch Pad. Add DCUO and DCUO Launch Pad to your firewall exceptions list.