Did you enable VT in the BIOS Setup (F2)?
Dear can you please guide me to enable hyper-v on sever 2008 R2. There is problem "the virtual machine could not be started because the hyper visor not running" message appear. I updates BIOS as well detail are Server poweredge 2950 III  (xeon E5310[NAME].6 ghz) Os      Sever 2008 R2 standard services pack 1 
Hyper v (visualization)