Microsoft released an update on January 11 that prevented computers from accessing shares on a Windows 7 & 2008R2 computer.  The problematic update was KB4480970. The patch that is meant to fix it is KB4487345. Install it on your Windows 7 and Win2008R2 computers.

Download here

http://www.catalog.update.microsoft.com/Search.aspx?q=KB4487345

Info

https://community.spiceworks.com/topic/2186232-ms-releases-patch-for-broken-smbv2-issues-in-kb4480970?source=superfeed

https://support.microsoft.com/en-us/help/4487345/update-for-windows-7-sp1-and-windows-server-2008-r2