Check out tug.org for a windows distribution of latex, it exists and is completely free.
Word doesn't offer the same flexibility that latex macros offer, since you don't initially write the document with a set of macros you can't go back and change a whole class of diagrams or equations by editing a macro. In word you have to go back and change each individual instance. Word in general doesn't look as pretty and requires you to worry about the placement and format of many things the TeX typsetting engine will do on it's own.
And most importantly, word doesn't come with a built in set of macros for you to edit, isn't well documented macro wise, and isn't free.
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