The Lockdown Browser is programmed to detect when conflicting programs are still running and will request that you close these programs. Some programs like the Dell Dock and Google Desktop run as a background process on your computer and will have to be shut down before you can proceed in the Lockdown Browser. You can usually turn these programs off through the task tray or, in the case of the Dell Dock, by right clicking on the application and clicking Exit. In some rare instances, these programs running in the background can cause the Lockdown Browser to lock up or stop responding. Programs that use Java or the Internet such iTunes and other media managers, file sharing agents like Bittorent, and instant messenger applications have a higher risk of causing the Lockdown Browser to lock up. It is best to close every program on your computer before starting the Lockdown Browser.