Also, try changing the DPI of your logo before pasting/importing into Word. A 300 DPI image and a 96 DPI image look the same in PDN, but when Word, and others grab it, the actual size of the image is used differently. This will prevent you from having to mess with resizing in Word. Basically the logo needs to be constrained in size to the standard format. Roughly 2 inches tall or if its 300 DPI, 600x600 pixels. @96 DPI, less than 200 pixels square ... Depending on which way you need to go is simply a matter of pasting a copy into the correctly formatted starting image size/DPI. EDIT: Only fair warning here is whether or not Word will play nice with your printer with source image DPI being ignored, etc. In some cases the printer drivers have to be kept in mind and page layout set before you can deterime what DPI you need to aim for to get the fit. I've found this to be less of a problem than some, but this is something that will cause you to lose some hair ...
That's about as close of a manip suggestion as I can manage to prevent resizing with tools like Word. No example logo or sizing information given to fully vet what exactly you'd need to do to the image/logo in question here as well. That makes for a lot of guess work.