Screen resolution, possibly very simple

Hi all

I have made a tetris game and i need to know how to compensate for different screens, I made the program on a CRT screen with 1024 * 768 but what confuses me is that when I use it on my girlfreinds laptop I set the screen resolution to the same as above, but I still get half of the app cut off.
What confuses me even more is that the form is the only thing that gets resized... I also have the form border style set to none and use an image for the background.
Can someone please tell me how to fix this problem without reworking any code, I would like to just check this in form load event, and if nececary take the appropriate action, Also the way I draw the game, it still apears as if everything is sized correctly except the form, it appears to be a height issue rather than width, does anybody know why this happens?:confused:

I have made the game as a tutorial aswell, with heavy commenting and justification as to why I have used each sub/function, and this is all thats needed to complete it. I will post it in another thread when I make this adjustment.

Thanks in advance...

Have you Docked / Anchored your controls on your Form ¿

No, none of the controls are docked or anchored, As the form cannot resize I do not need to. the thing that confuses me is for example, if the form is 200 * 400, and the area which I paint the game is a rectangle of 180 * 300 (located at point 10,50), the form will apear shorter than the area I paint the rectangle, but WHY! when the forms height is set to 400, and the rectangle i paint is only 300 and its located at 50. I should have the same area below the area I paint as I do above it. I should have done all painting and sizing by percentages rather than fixed sizes, but its too late for that and I really cant be screwed reworking all the code.
Could it have anything to do with the image I am using for the background?

I will upload the project soon...