Also you need to change the NTLM authentication level in Windows 7.
Network security: LAN Manager authentication level
Please change the NTLM authentication level to “Send LM & NTLM – use NTLMv2 session security if negotiated”. Please refer the following article.
Configuring this security setting
You can configure this security setting by opening the appropriate policy and expanding the console tree as such: Computer ConfigurationWindows SettingsSecurity SettingsLocal PoliciesSecurity Options