You have now successfully changed Microsoft Word 2007's default "save to" location. Now whenever you go to save a document, this location will automatically be chosen for you.
Also, remember to always save your documents frequently while working on them. Otherwise you risk losing data if the computer shuts off due to an unexpected power failure, if your computer freezes, or you have any other computer problems. After you have initially saved your document, you can simply use this keyboard shortcut to save your document as you work: CTRL+S.