since yesterday I had my Windows 2012R2 Datacenter server correctly running Hyper-V machines. After a windows update I'm not able to start any of the VMs and get a message that say Hypervisor not in execution. If I check from services I don't see the service but from server manager the hyperv role seems to be running. From windows features list i don't see anymore the Hyper-v (i wanted to uninstall and reinstall it).
Any suggestion?