How can I solve the Win7 family group?

1. Press windows+R to open the win7 system running window, enter [gpedit.msc], press Enter to open the group policy;

2. Open [Expand Computer Configuration] in the opened group policy dialog box. ——[Windows Settings]——[Security Settings]——[Local Policies], click Security Options to find Network Security: LAN Manager Authentication Level;

3. Double-click to verify Change the level to Send LM and NTLM Response (&), make sure to open Control Panel —— Network and Sharing Center, check whether the current network settings are working network or public network. If it is a public network, click Public Network, change to Work network, the computer can be restarted.