I would also suggest that if you are using Google fonts, just use their one line of code in your head and let them serve up the fonts.
But as Paul said, I would also recommend using FontSquirrel instead. If that site has the same font as the one you are using, you can download all of the font versions and CSS you need to get started straight away.
A .woff file on its own is not enough for fonts to work, as you need various versions of a font for it to work in all browsers. If Google only provided you with a .woff file, it might explain why I can never get Google fonts to work in all browsers. I found it so annoying that I gave up on Google fonts altogether.