Release January 8, 2019—KB4480970 (Monthly Rollup) for Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1 has Known issues that give you BIG problem.
Out of all the problem, i will cover two of them:
1. SMBv2 stops workling
Symptom from Microsoft
SMBv2 could not be connected anymore after installing this patch. The admins with networks using SMBv2 shares are reporting the bug.
2. Network interface controller may stop working
Symptom from Microsoft
After you apply this update, the network interface controller may stop working on some client software configurations. This occurs because of an issue related to a missing file, oem.inf. The exact problematic configurations are currently unknown.
For more information, check Microsoft own article about this update:
https://support.microsoft.com/nb-no/help/4480970/windows-7-update-kb4480970