Stop Aplication during phone reboot

How to stop aplications getting started during phone Boot?In c:/system/ there is a folder named "recogs", this folder conatins.mdl files will act as a shortcut to the actual application. During system startup all these mdl files will be read and started up. If you edit this file to point to nonexisting file then the application wont startup again. Don't delete the files as they will be recreated