Mac vs pc webpage appearance

My webpage (created on a Mac) loads correctly using a Mac but the scale becomes too large when using a PC.

I've heard it isn't a mac or pc thing, it is a browser thing i.e. Safari on Mac vs I.E. on PC

You might want to test your webpages in multiple web browsers. Expecially IE and Foxfire. If you can create the page simply to a lowest common denominator then you have to start writing Javascript to discover when web browser your loaded into and then use that information to "correct" the page to display it the way you want it to.

Before you do that, convert as much of the webpage as you can to CSS controlled display and see if that helps.