buy it someplace like here: http://www.discountmountainsoftware.com/miof20stdoon.html?cmp=pg&utm_source=pricegrabber.com&utm_medium=cse&utm_term=Microsoft+Office+2007+Standard+DOWNLOAD+ONLY+for+2+PCs&utm_campaign=pricegrabber
If you are in school or college, you can qualify for the student edition, which costs less.
There are no free downloads of Office. If you meant that you own a copy, have a license, but lost the disc, Microsoft will often replace the media.
Which is your case?