PK,
Hard to say... On my two computers (win7 and vista) the page looks exactly the same. Your font issue, could it be that you have used some font for the page that is not installed on both computers?
I also downloaded your source code and opened it in the HTML Editor and found something interesting, mainly for the CC developers:
When I previewed your site in the Editor's external preview, the menu was vertical. When I previewed it in the Editor, selecting 'Local preview' the pages had a horizontal menu in IE, FF and Safari, all latest versions. BUT, when I, having the external preview window open and selecting 'Preview in browser' the menu was vertical in the same three browsers. How come? In Prteferences I had set IE9 as my default browser for previewing. Eric, do you get the same?