The location of the Respondus Projects folder (which stores your data files and other program settings) is selected during the installation of Respondus 4. The default location is the user's "My Documents" folder on the local drive ("C:\Users\{username}\Documents\"). If the location of this folder is changed after the installation of Respondus 4, go to File > Preferences > General and then "Update" the location of the Respondus Projects folder.