I’m sorry, Eve, I didn’t mean to make matters worse. 
Please keep in mind that I have not myself installed the version of Office you will be installing. However, every version of Office I have installed since version 4 (circa 1994) has started with a 3-way option. You could run[ol][li]the standard installation, which requires the least input from you but which results in a relatively hefty chunk of your hard drive space being given over to the program,[]a custom installation, which requires the greatest amount of input from you but which gives you the option to (to a degree, anyway) completely avoid installing the parts of the program you don’t want (like Excel, PowerPoint, Access, etc.), or []the minimal installation, designed for laptops, which is like the standard installation “lite,” in other words, it requires fairly little interaction but doesn’t install everything the standard does.[/ol][/li]
Your needs will dictate what you need to install, but if I were in your shoes and only wanted Word, I would run the custom installation. My caveat here (and above) is that you won’t have any luck if you just go into the custom installation and uncheck everything but Word. The installer program will come back and tell you (probably more than once) that you have unchecked something that you must have in order to use Word. So this will be a hassle.
On the other hand, it’s just a hassle, it’s not actually hard. Whenever it tells you you have to have something you’ve unchecked, just tell it to install that. It’s not like you actually need to know why you need it. 