Incorrect scaling of objects on certain video card

Does anyone have an issue with incorrect scaling of objects using opengl in certain video cards?
The code is using Gl.GL_POLYGON and loops through each vertex of an object while setting Gl.glNormal3fv and Gl.glVertex3fv.
It is drawn on a SimpleOpenGlControl. The object renders correctly on desktop computers(XP and Vista) that were tested but some of the laptops(Vista) that were tested did not have the correct scaling (It would appear much smaller and in the lower left of the control when it should appear larger and in the center of the control).
Any suggestions would help.

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