FIrst of all, the night stalker is not useless. It is a very good scope.
If you cannot zero the scope using the amount of adjustability that the cross hairs can move (like any other scope in the world), then the problem is not with the scope, the problem is with the way your scope is mounted to the rifle, or you may have some droop in the barrel, or the velocity of the rifle is very low.
Either way, the solution to fix this problem is to either use amount with a built in angle in the rail, or use height adjustable rings, or the most common method is to shim the rings. If you search "shim a scope" on you tube you'll find plenty of videos showing you how to do this.