Installed from Oracle site & Ubuntu Software Centre.
It worked once and now reports this error every time on Start:
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Failed to open a session for the virtual machine win7.
VT-x features locked or unavailable in MSR. (VERR_VMX_MSR_LOCKED_OR_DISABLED).
Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb}
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uid=1000(anish) gid=1000(anish) groups=1000(anish),4(adm),20(dialout),24(cdrom),46(plugdev),112(lpadmin),120(admin),122(sambashare),123(vboxusers)
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VBoxManage showvminfo "win7"
Name: win7
Guest OS: Windows 7 (64 bit)
UUID: b81d33eb-edb5-41ab-b7cb-c5ee231f7821
Config file: /home/anish/VirtualBox VMs/win7/win7.vbox
Snapshot folder: /home/anish/VirtualBox VMs/win7/Snapshots
Log folder: /home/anish/VirtualBox VMs/win7/Logs
Hardware UUID: b81d33eb-edb5-41ab-b7cb-c5ee231f7821
Memory size: 4096MB
Page Fusion: off
VRAM size: 21MB
CPU exec cap: 100%
HPET: off
Chipset: piix3
Firmware: BIOS
Number of CPUs: 1
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
PAE: off
Time offset: 0 ms
RTC: local time
Hardw. virt.ext: on
Hardw. virt.ext exclusive: on
Nested Paging: off
Large Pages: off
VT-x VPID: on
State: powered off (since 2011-09-17T05:17:19.682000000)
Monitor count: 1
3D Acceleration: off
2D Video Acceleration: off
Teleporter Enabled: off
Teleporter Port: 0
Teleporter Address:
Teleporter Password:
Storage Controller Name (0): IDE Controller
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 Controller
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 Controller (1, 0): Empty
SATA Controller (0, 0): /home/anish/VirtualBox VMs/win7/win7.vdi (UUID: 2be95da8-3fa2-42c9-8e01-4ea05d707c1c)
NIC 1: MAC: 0800278ABD99, Attachment: NAT, Cable connected: on, Trace: off (file: none), Type: 82540EM, Reported speed: 0 Mbps, Boot priority: 0, Promisc Policy: deny
NIC 1 Settings: MTU: 0, Socket (send: 64, receive: 64), TCP Window (send:64, receive: 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
Audio: enabled (Driver: PulseAudio, Controller: HDA)
Clipboard Mode: Bidirectional
VRDE: disabled
USB: enabled
USB Device Filters:
<none>
Available remote USB devices:
<none>
Currently Attached USB Devices:
<none>
Shared folders: <none>