I just made new install latest Libre elec on Pi3+ , no SAMBA , I'm with Win 7 , tried to find some tutorial - no any success . Any help ?
We don't even know what the problem is - are you having a problem accessing your Windows share from LibreELEC, or are you having a problem accessing the LibreELEC shares from Windows?
Assuming the former, have you read the blog which explains you must now enable authentication when accessing the Windows share (create a username/password in Windows, add this user to your Windows share, use this username/password when accessing the Windows share from LibreELEC).