On Tuesday, Microsoft began rolling out Windows 7 KB4480970 which reportedly broke the network settings on some systems. According to various reports from forums, Windows 7 KB4480970 is causing network issues on some computers.
If you install the January 2019 cumulative update on your Windows 7 device which is on a network that uses SMBv2, you will experience unexpected network connectivity issues.
Try this command to fix it: (Need Admin Right)
reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\system /v LocalAccountTokenFilterPolicy /t REG_DWORD /d 1 /f