I have a ESXi 5.1.1 server. I have several VMs on this server. All are running Windows 2008 R2. If i reboot the servers they all lose their network connection. The network adapter status is shown as: This device cannot start (Code 10).
I tried disabling the adapter and re enabling. I tried removing it. I tried adding the basic adapter. VM Tools is installed. I tried uninstalling the VMware tools and removing all the adapters and then rebooting and then adding the adapter and the same result occurs....the adapter does not start.
Also check if you have the latest VMWare tools installed.
If nothing else helps try removing network adapters from virtual machines setup and add a new one with a different type selected.