Try OpenOffice, very good and free - and as far as I'm aware supports Micro$oft Office / Word files.
http://www.openoffice.org/
for open officeyou can get msword for like 90 quid as part of the student and home pack comes with excel and something else. It's industry standard for a reason tbh.
If you dont want the full office suite, you can just download AbiWord on its own, or better still, if you dont want clutter, you can download it as a portable application that you can install on usb or hard disk.