Microsoft released convenient rollup update for Windows 7 and Server 2008 R2 in late May 2016. This rollup update will bring your installation to the latest patch level with only a few installations but it has a bad side effect. All VMs running on vSphere (it seems that ALL vSphere versions are affected) and use the VMware proprietary VMXNet3 type of virtual network card will prbably being hit by network issues. The reason behind this is that after applying the update, the OS will create a new vNIC but the settings for the old vNIC will still reside in the registry. This will lead to network problems.
You can get some more details on the link above or here. VMware currently recommends to delay installation of this rollup package until there is a resolution from Microsoft.