Hi,
That is because the Windows user you are using on your local computer doesn't exist on the remote computer.
When you share a drive, it is normally shared for "All Users", meaning all users defined on the computer.
Check what specific shared permissions are set on your other folder (the one you can access), it is possible that it also has the "Guest" account authorized.
If the "Guest" account is authorized, then even unknown users (to the local computer) are allowed to see the files.
The other option for you would be to "Map a drive", because you would then be abe to specify the user/password you want to use.
This is described on the following guide:
Map a remote network drive or folderLet us know how that goes,