A family of Microsoft word processing software products for creating web, email, and print documents.
This is a Registry/Options setting. As long as no path is specified for pictures, Word will open to the last-used folder. Go to File | Options | Advanced: File Locations and make sure the location for "Images" is blank. If you aren't able to do this through the Options (Word doesn't allow you to clear the path), it will have to be done through the Windows Registry. The likely path is Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Word\Options; I can't tell you the exact key because I don't have it (my "Images" location is empty), but I would guess that deleting that key would do the trick (be sure to export it first in case you need to restore it).
Alternatively, you could, at least temporarily, set the folder you're using as the default location. For more on that, see https://www.howtogeek.com/265902/how-to-change-the-default-insert-picture-location-in-microsoft-word/ (written for a later version, but the process is the same).