Installing fonts in Microsoft Windows®

Installing fonts in Microsoft Windows® is quick and simple. Once fonts are installed in Windows, they are available to your Office programs.

Many font packages you download from the Internet may be contained in compressed .zip files to reduce file size and make downloading faster. If you have downloaded a font that is saved in .zip format, you can "unzip" it by double-clicking the icon for the font and following the instructions on the screen.

http://office.microsoft.com/en-gb/assistance/HA010947421033.aspx