Open your template by double-clicking the file name in the left window. Then click the Install button below. At the prompt, click the "Copy the document" button to accept the default "Your PC Made Easy" directory, or click Browse if you want to store the template somewhere else. The document should also open in the appropriate program, and you may want to resave it in another folder if you make changes to it.
You'll need Microsoft Works on your PC to open the wedding gift list database. If you don't have Works, a spreadsheet is included for Excel or compatible programs.