As wjosten already said: restrictions cannot be set for system apps.
How many screens you have? 5,6,7... And how many app folders?? That can not cost much time.
If your iPhone has been jailbroken, we can do nothing for you, but if not:
You can do a full restart (reset) by holding the Sleep/wake Button AND the Home Button at the same time, keep holding, ignore the slider on the screen and keep holding, when you see the white apple logo you can let go and let the iPhone start up.
If that does not do it "Reset Home screen" like AnaMusic suggested.