Every time a new OS is developed, there is a good chance that some of the applications that ran fine on previous versions might not work on the new one. This might be the case with Windows 7. There is a way around this. Right-click on the application that you are facing problems with, and click on Troubleshoot compatibility. Windows 7 will detect the problems if any and then run the application in a compatibility mode. If the application works, you can save the settings for that application so that it will be run using the same settings the next time.