Open System by clicking the Start button , clicking Control Panel, clicking System and Maintenance, and then clickingSystem.
Click Advanced System Settings. If you are prompted for an administrator password or confirmation, type the password or provide confirmation. Under Performance, click Settings. Click the Data Execution Prevention tab, and then click Turn on DEP for all programs and services except those I select. Add Luna's Client to the exceptions list.
This is supposed to fix that, but I'm not sure how well it works. I tried it before and it still happened, just not as often.