From Chris Goettl, our Patch Management expert:

A quick heads up.  The Convenience Update for Windows 7 SP1 and Server 2008 r2 SP1 is causing issues with VMs running VMware VMXNet3 virtual network adapter type.

According to a blog post by VMware and a post by Microsoft uninstalling the update will resolve the issue.  The Microsoft article goes on to talk about an issue with Microsoft App-V where virtual applications may have difficulty loading.

Recommendation in both cases is to defer pushing this update until a resolution is in place.
Orginally published at http://blog.shavlik.com/windows-convenience-update-causing-inconvenience-vmware-app-v/