Not certain, I just 'googled' a few things. But does this help? - http://www.howtogeek.com/howto/26559/change-the-default-save-folder-for-windows-7-libraries-to-something-else-like-your-dropbox/ may be worth checking how yours are set anyway.
Or maybe http://www.question-defense.com/2010/03/04/change-windows-7-default-file-save-location
No need to download anything, just read and compare.
If no joy, hopefully someone will assist soon