every time I try to offset a polysurface, I get millions of white arrows all over the selected item and the computer freezes . Can anyone help please.

It’s normal that you get the arrows - they allow you to see in which direction the surfaces will be offset.
Is the freezing temporarily?
Can you post the model and your OpenGL information?

Thank you for your answer, I will send you the model tomorrow as it is now 12.27am.

How many surfaces are in the polysurface? How many control points in the individual surfaces?