This message is displayed when a windows service tries to interact with your desctop like try to display a window, send a DDE message to another app runing in the windows session, etc. This is not the usual behaviour of windows services. the service you talked about might be a virus/malware. you can go to services.msc and select properties of the service and go to Log On. Deselect 'Allow service to interact with desktop'. This should stop the service from sending messages to the desktop. If this option is enabled again on its own then there is something fishy for sure. so get rid of that service if you didn't install it and don't know what it does.