Virtualbox 4.3 only supports 32-bit guests

[akertis]

I have an optiplex 990 with the latest bios and virtualization enabled in the bios but VirtualBox will not work with 64 bit guests.

C:\Program Files\Oracle\VirtualBox>VBoxManage.exe showvminfo "Windows 7 Pro x64"
 --details
Name:            Windows 7 Pro x64
Groups:          /
Guest OS:        Windows 7
UUID:            36be8f72-a364-4e60-81bd-69a500866391
Config file:     C:\Users\VirtualBox VMs\Windows 7 Pro x64\Windows 7 Pro
 x64.vbox
Snapshot folder: C:\Users\VirtualBox VMs\Windows 7 Pro x64\Snapshots
Log folder:      C:\Users\VirtualBox VMs\Windows 7 Pro x64\Logs
Hardware UUID:   00000000-0000-0000-0000-000000000000
Memory size:     512MB
Page Fusion:     off
VRAM size:       27MB
CPU exec cap:    100%
HPET:            off
Chipset:         piix3
Firmware:        BIOS
Number of CPUs:  1
PAE:             off
Long Mode:       off
Synthetic CPU:   off
CPUID overrides: None
Boot menu mode:  message and menu
Boot Device (1): Floppy
Boot Device (2): DVD
Boot Device (3): HardDisk
Boot Device (4): Not Assigned
ACPI:            on
IOAPIC:          on
Time offset:     0ms
RTC:             local time
Hardw. virt.ext: on
Nested Paging:   on
Large Pages:     on
VT-x VPID:       on
VT-x unr. exec.: on
State:           powered off (since 2013-10-16T19:35:31.212000000)
Monitor count:   1
3D Acceleration: off
2D Video Acceleration: off
Teleporter Enabled: off
Teleporter Port: 0
Teleporter Address:
Teleporter Password:
Tracing Enabled: off
Allow Tracing to Access VM: off
Tracing Configuration:
Autostart Enabled: off
Autostart Delay: 0
Default Frontend:
Storage Controller Name (0):            IDE
Storage Controller Type (0):            PIIX4
Storage Controller Instance Number (0): 0
Storage Controller Max Port Count (0):  2
Storage Controller Port Count (0):      2
Storage Controller Bootable (0):        on
Storage Controller Name (1):            SATA
Storage Controller Type (1):            IntelAhci
Storage Controller Instance Number (1): 0
Storage Controller Max Port Count (1):  30
Storage Controller Port Count (1):      1
Storage Controller Bootable (1):        on
IDE (1, 0): C:\Users\Downloads\en_windows_7_professional_with_sp1_x64_dv
d_u_676939.iso (UUID: ac6a67e0-a356-46fe-84ce-b044f5451b5c)
SATA (0, 0): C:\Users\VirtualBox VMs\Windows 7 Pro x64\Windows 7 Pro x64
.vdi (UUID: 25010c27-a29e-4215-afa7-91f9d7eaedd7)
NIC 1:           MAC: 080027E4ED27, Attachment: NAT, Cable connected: on, Trace:
 off (file: none), Type: 82540EM, Reported speed: 0 Mbps, Boot priority: 0, Prom
isc Policy: deny, Bandwidth group: none
NIC 1 Settings:  MTU: 0, Socket (send: 64, receive: 64), TCP Window (send:64, re
ceive: 64)
NIC 2:           disabled
NIC 3:           disabled
NIC 4:           disabled
NIC 5:           disabled
NIC 6:           disabled
NIC 7:           disabled
NIC 8:           disabled
Pointing Device: USB Tablet
Keyboard Device: PS/2 Keyboard
UART 1:          disabled
UART 2:          disabled
LPT 1:           disabled
LPT 2:           disabled
Audio:           enabled (Driver: DSOUND, Controller: HDA)
Clipboard Mode:  disabled
Drag'n'drop Mode: disabled
VRDE:            disabled
USB:             enabled
EHCI:            enabled

USB Device Filters:

<none>

Available remote USB devices:

<none>

Currently Attached USB Devices:

<none>

Bandwidth groups:  <none>

Shared folders:  <none>

VRDE Connection:    not active
Clients so far:     0

Video capturing:    not active
Capture screens:    0
Capture file:       C:\Users\VirtualBox VMs\Windows 7 Pro x64\Windows 7
Pro x64.webm
Capture dimensions: 1024x768
Capture rate:       512 kbps
Capture FPS:        25

Guest:

Configured memory balloon size:      0 MB

[akertis]

Guest log

[Frank Mehnert]

Please select the OS type "Windows 7 (64 bit)" and your guest will work. This is a bit more strict than with older VBox versions.

[Ramshankar Venkataraman]

For the sake of spiders, one can also use:

VBoxManage modifyvm <vmname> --longmode on

To set that it's a 64-bit capable guest.