微軟2019年1月定期更新，讓Win7 Home版共用變成無法存取，如果需要恢復，需要安裝2019/1/11的更新。Windows 7 的更新 (KB4487345)

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https://www.catalog.update.microsoft.com/Search.aspx?q=windows+7

https://support.microsoft.com/zh-tw/help/4487345/update-for-windows-7-sp1-and-windows-server-2008-r2
Description of the update for Windows 7 SP1 and Windows Server 2008 R2: January 11, 2019
適用於： Windows 7 Service Pack 1Windows Server 2008 R2

Summary

This update 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.