Enabled Intel virtualization @ BIOS level still Hyper V Platform is Grayed out.

Here's the BIOS settings as shown by Coreinfo:

OS is 8.1 PRO 64 BIT. Hardware is HP xw8600 W/S.

Intel(R) Xeon(R) CPU           E5410  @ 2.33GHz
Intel64 Family 6 Model 23 Stepping 6, GenuineIntel
HTT             *       Hyperthreading enabled
HYPERVISOR      -       Hypervisor is present
VMX             *       Supports Intel hardware-assisted virtualization
SVM             -       Supports AMD hardware-assisted virtualization
EM64T           *       Supports 64-bit mode

SMX             -       Supports Intel trusted execution
SKINIT          -       Supports AMD SKINIT

NX              *       Supports no-execute page protection
SMEP            -       Supports Supervisor Mode Execution Prevention
SMAP            -       Supports Supervisor Mode Access Prevention
PAGE1GB         -       Supports 1 GB large pages
PAE             *       Supports > 32-bit physical addresses
PAT             *       Supports Page Attribute Table
PSE             *       Supports 4 MB pages
PSE36           *       Supports > 32-bit address 4 MB pages
PGE             *       Supports global bit in page tables
SS              *       Supports bus snooping for cache operations
VME             *       Supports Virtual-8086 mode
RDWRFSGSBASE    -       Supports direct GS/FS base access

FPU             *       Implements i387 floating point instructions
MMX             *       Supports MMX instruction set
MMXEXT          -       Implements AMD MMX extensions
3DNOW           -       Supports 3DNow! instructions
3DNOWEXT        -       Supports 3DNow! extension instructions
SSE             *       Supports Streaming SIMD Extensions
SSE2            *       Supports Streaming SIMD Extensions 2
SSE3            *       Supports Streaming SIMD Extensions 3
SSSE3           *       Supports Supplemental SIMD Extensions 3
SSE4a           -       Supports Sreaming SIMDR Extensions 4a
SSE4.1          *       Supports Streaming SIMD Extensions 4.1
SSE4.2          -       Supports Streaming SIMD Extensions 4.2

AES             -       Supports AES extensions
AVX             -       Supports AVX intruction extensions
FMA             -       Supports FMA extensions using YMM state
MSR             *       Implements RDMSR/WRMSR instructions
MTRR            *       Supports Memory Type Range Registers
XSAVE           -       Supports XSAVE/XRSTOR instructions
OSXSAVE         -       Supports XSETBV/XGETBV instructions
RDRAND          -       Supports RDRAND instruction
RDSEED          -       Supports RDSEED instruction

CMOV            *       Supports CMOVcc instruction
CLFSH           *       Supports CLFLUSH instruction
CX8             *       Supports compare and exchange 8-byte instructions
CX16            *       Supports CMPXCHG16B instruction
BMI1            -       Supports bit manipulation extensions 1
BMI2            -       Supports bit manipulation extensions 2
ADX             -       Supports ADCX/ADOX instructions
DCA             *       Supports prefetch from memory-mapped device
F16C            -       Supports half-precision instruction
FXSR            *       Supports FXSAVE/FXSTOR instructions
FFXSR           -       Supports optimized FXSAVE/FSRSTOR instruction
MONITOR         *       Supports MONITOR and MWAIT instructions
MOVBE           -       Supports MOVBE instruction
ERMSB           -       Supports Enhanced REP MOVSB/STOSB
PCLULDQ         -       Supports PCLMULDQ instruction
POPCNT          -       Supports POPCNT instruction
LZCNT           -       Supports LZCNT instruction
SEP             *       Supports fast system call instructions
LAHF-SAHF       *       Supports LAHF/SAHF instructions in 64-bit mode
HLE             -       Supports Hardware Lock Elision instructions
RTM             -       Supports Restricted Transactional Memory instructions

DE              *       Supports I/O breakpoints including CR4.DE
DTES64          *       Can write history of 64-bit branch addresses
DS              *       Implements memory-resident debug buffer
DS-CPL          *       Supports Debug Store feature with CPL
PCID            -       Supports PCIDs and settable CR4.PCIDE
INVPCID         -       Supports INVPCID instruction
PDCM            *       Supports Performance Capabilities MSR
RDTSCP          -       Supports RDTSCP instruction
TSC             *       Supports RDTSC instruction
TSC-DEADLINE    -       Local APIC supports one-shot deadline timer
TSC-INVARIANT   -       TSC runs at constant rate
xTPR            *       Supports disabling task priority messages

EIST            *       Supports Enhanced Intel Speedstep
ACPI            *       Implements MSR for power management
TM              *       Implements thermal monitor circuitry
TM2             *       Implements Thermal Monitor 2 control
APIC            *       Implements software-accessible local APIC
x2APIC          -       Supports x2APIC

CNXT-ID         -       L1 data cache mode adaptive or BIOS

MCE             *       Supports Machine Check, INT18 and CR4.MCE
MCA             *       Implements Machine Check Architecture
PBE             *       Supports use of FERR#/PBE# pin

PSN             -       Implements 96-bit processor serial number

PREFETCHW       *       Supports PREFETCHW instruction

Maximum implemented CPUID leaves: 0000000A (Basic), 80000008 (Extended).

Hi.

A simple mouse-over the checkbox will provide the exact reason. Hopefully. I mean, I saw systems where the mouse-over said for example "processor does not feature SLAT".

If you run systeminfo from an administrator command prompt. The system will tell you the Hyper-V Requirements and if they are met by your system.

Yup, its SLAT.

Did you cold boot after enabling DEP or -VT/-V?

On laptops that could mean pulling the battery.

Tried with no luck.

Then the usual reply is to be sure and upgrade the BIOS to the latest.

Also, just because the chipset supports it, does not mean that the motherboard supports it.  I have seen this in the past.  And vice-versa.

I guess its BIOS. Unfortunately HP hasn't released it for Windows 8/8.1 xw8600 Workstation. I might have a better luck with newer m/c.

Thanks.

  The 8600 is getting a bit long in the tooth! On release the recommended OS was Vista Business.

Hi,

I doubt whether your computer processer support SLAT, please use coreinfo utility to check. You can refer to the link below for more details.

Hyper-V: List of SLAT-Capable CPUs for Hosts:

http://social.technet.microsoft.com/wiki/contents/articles/1401.hyper-v-list-of-slat-capable-cpus-for-hosts.aspx

Your CPU does not support SLAT or EPT as Intel calls it. Therefore you cannot run Hyper-V on Windows 8 or higher.

The info  for your CPU can be found here http://ark.intel.com/products/33080/Intel-Xeon-Processor-E5410-12M-Cache-2_33-GHz-1333-MHz-FSB

Your CPU doesn't support SLAT, so a BIOS upgrade won't help.

http://ark.intel.com/products/33080/Intel-Xeon-Processor-E5410-12M-Cache-2_33-GHz-1333-MHz-FSB

Specifically:

Intel VT-x with Extended Page Tables (EPT)

No

You can use the -v switch for coreinfo to get the only the info you need:

coreinfo.exe -v

this will return hypervisor, vmx, and ept values

• Edited by Steve JainMVP 14 hours 22 minutes ago added info