your topic says free download, if you want a free word processor i would recommend open office, it has all a word processor and spreadsheet as well. go to www.openoffice.org and you can download and install it for free.
In case office is complicate to use and can't download it (as it is a paid software) then you can look for its alternatives. I would suggest using Abiword or neooffice(for mac OS X). To read more about these and few other programs, please head over to www.wordprocessorfree.com where you can get lots of online and offline word processor tools.