To use the "Save Password" option you will need to install "Client for Microsoft Networks" in the Network Control Panel. Open the Network Control Panel by double-clicking on "My Computer" then "Control Panel" and select "Network". Once you've opened the Network Control Panel, click the "Add" button. Choose "Client" and click "Add" again. Choose "Microsoft" as the manufacturer, and select "Client for Microsoft Networks". Once you've added it, close the control panel and restart your computer. Windows may prompt you for a username and password after you reboot. Input a username, but leave the password field blank.