First step: Open the Guest account. Click the Desktop Start button, locate Control Panel and open, select User account and click to bring up a window, continue to click "Manage other Accounts" below, then select "Guest" and click "Enable".
Step Two: in the Shared and Security tab of the shared folder, add the Everyone group to the permissions group or user name for the shared file.
Step three: at the same time, press and hold the Window+r key on the keyboard, pop up the "Run" dialog box, enter Secpol.msc in the "Open" column, go to the "Local Security Policy" window, select "Security Options" in "Local Policy" and click, in the right window "policy" column found " Network access: Share and security model for local accounts and double-click to pop up its properties window, select "Guest only-local user authenticate as guest" at the top of the window, and then click OK to finish.
Windows Server R2 How to set up shared folder access no need to enter a user name and password