I can't open any virtual machine on VirtualBox [duplicate]

I'm using Ubuntu 17.0.4.

The error code is :

Failed to open a session for the virtual machine windws 7.
VT-x is disabled in the BIOS for all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED).
Result Code: NS_ERROR_FAILURE (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

1 Answer

Please try these ways:

1. Go to your BIOS settings (By pressing F12, F2, F8, or Delete, ... depends on machine).

   And make sure Virtualization option (It can be have names like VT-d or AMD-V or Intel Virtualization Technology or Virtualization or ...) to be enabled. (And if its be disable make it enable)

2. Go to VirtualBox settings >> System >> Motherboard

   And then increase RAM size (For example to 2GB is good).

3. Go to VirtualBox settings >> System >> Acceleration

   And then Uncheck the Enable VT-x/AMD-V option.