Recently, Microsoft released a monthly update KB4480970 and security update KB4480960 for Windows 7, but users have various problems after the upgrade, including the inability to use SMBv2, the device is marked as “non-genuine”, etc… Today, Microsoft released the KB4487345 patch to “resolves the issue where local users who are part of the local “Administrators“ group may not be able to remotely access shares on Windows 7 SP1 and Windows Server 2008 R2 machines after installing the January 8th, 2019 security updates. This does not affect domain accounts in the local “Administrators” group.”
This update will not be pushed via Windows Update and will only be available through the Microsoft Update Catalog website. This means that Windows 7 users need to manually install it on their computers. Microsoft may include this fix in February Tuesday patch day.