I needed to reinstall Windows 2012 R2 after enabling VT in BIOS.
After building Windows 2012 R2 on 2 Dell PowerEdge R610 servers, I tried to install the Hyper-V role and keep getting error that the requested feature has failed installation with an unexpected error and to check the Event Viewer for possible causes. There is nothing that I can find in events. I have enabled VT in bios and even reset bios to factory and enabled VT again, updated R610 BIOS to v6.4 and still no luck. I must be doing something wrong. Can someone help? I have screen shots of errors if that helps.   Sam  
Windows 2012 R2 - Hyper-V Role will not install on R610 Servers