The program will default to the setting you stipulated when you first installed the program, there is no way to alter that without uninstalling / reinstalling.
Have you gone to the preferences screen and enabled the option to "Show a message when inserting video clip into timeline"
What this will do is spot if the clip is different to the project settings
e.g. inserting a NTSC video into a PAL project and then prompt you to let it alter the project settings to match.
Not at home right now but here is a screen shot from an earlier version of VideoStudio
