I was following the instructions in your Knowledgebase article on DEP settings; so I hit the system option, then "advance tab", then settings which brings up "visual effects". I had never seen this screen which gives you the option to change settings for your computer's performance and visual effects. Since I'm not real big on graphics I changed the option from "let windows decide whats best for my computer" to "adjust for best performance". I then made the other changes as listed on your article. As you know the SC2 games did not work which I kind of blamed on the games not being compatible with windows 7. Only later when another program (which always worked) suddenly was not working, did I retrace my steps, changed the setting back to where it was originally and both the program and your games work. I know my reply was wordy but hopefully it makes sense.