There is no adequate replacement for MS Word, in my opinion.
That said, I recommend using WordPad if you don't have MS Word.
WorPad has been improved and expanded greatly over previous versions thereof.
If you haven't taken a look at the WordPad included with Win 7, I recommend such. You will be amazed. You will think you've got Word installed.
I always suggest this approach to the poor, starving student who can not even afford a schools "MS Office" for students offering.