you can download free trial version from microsoft's website. http://office.microsoft.com/en-us/downloads
after downloading the trial version, select microsoft word from the installation window.
if you're looking for full version, you have to buy it from a local software vendor/website. you can't get it for free.
just in case, read the rules of conduct:http://www.tomshardware.com/forum/5031-63-read-first
if you still need a free, fully featured word processor, consider using libreoffice. libreoffice is free, fully featured, can use most of the popular document formats.http://www.libreoffice.org/