Many users are faced with a paradoxical situation: the physical computer has a powerful 64-bit processor, but the program VirtualBox stubbornly suggests creating only a 32-bit virtual machine. It is a common misconception that the host system or the hypervisor itself is limiting. In fact, the problem most often lies in the BIOS/UEFI settings or in the default settings of a specific virtual machine.
Understanding the difference between processor architecture and emulation settings are critical for stable operation. If you try to install a modern operating system, for example, Windows 10 or Ubuntu, on a virtual machine with the selected x86 (32-bit) architecture, the installer will simply refuse to start or will be extremely unstable. In this article we will look at why this happens and how to forcefully activate support for 64-bit systems.
It is worth noting that he Oracle VM VirtualBox has not released separate versions only for 32-bit hosts for a long time. Modern program distributions require a 64-bit environment for installation, but they remain fully compatible with older guest OSes. Backward Compatibility - This is a key feature that allows you to run ancient software on new hardware without losing functionality.
Why doesn't VirtualBox see 64-bit systems?
The most common reason why there are no options marked (64-bit) in the list of available operating systems is that virtualization technology is disabled at the motherboard level. Processors Intel use technology VT-x, and AMD — AMD-V. If these functions are blocked in the BIOS, the hypervisor is physically unable to switch the processor to the long instruction mode required for 64-bit emulation.
The second common problem is conflict with other virtualization programs. In operating systems Windows built-in hypervisor Hyper-V may block access VirtualBox to processor hardware resources. When this happens, the program enters software emulation mode, which only supports 32-bit guests. This often happens after Windows updates or Docker installations.
⚠️ Warning: If you have Hyper-V enabled, VirtualBox may run significantly slower or display the error ERR_VMX_MSR_ALL_VMX_DISABLED. You must completely disable the Windows virtualization platform for it to work correctly.
It is also worth checking the version of the program itself. Although support for 32-bit hosts was removed in version 7.0, older versions (such as 6.1) can still run on 32-bit systems, but they will not be able to run 64-bit guest OSes due to architectural limitations of the processor itself in such configurations.
Setting up BIOS and UEFI for virtualization
To activate the necessary functions, you will need to enter the motherboard firmware settings. The login process varies by manufacturer, but typically requires pressing a key Del, F2 or F10 immediately after turning on the computer. Find the partition associated with the processor, often called CPU Configuration, Advanced or Security.
Inside the menu you need to find the parameter responsible for virtualization. For processors Intel it may be called Intel Virtualization Technology, VT-x or Vanderpool. For AMD look for SVM Mode, SVM Support or AMD-V. Make sure the value is set to Enabled.
What to do if the item is not in the BIOS?
If you don't find the virtualization option, try updating your BIOS to the latest version. Sometimes manufacturers add this feature in later firmware revisions. The option may also be hidden in the Security -> Secure Boot Configuration section.
After enabling the function, be sure to save the changes, usually this is done with the key F10, and restart your computer. Without this step, the operating system will not be aware of the changes, and hardware virtualization will remain unavailable to programs.
Instructions: creating a 64-bit virtual machine
After eliminating hardware blockages, you can begin creating a virtual environment. Run Oracle VM VirtualBox and press the button Create (or New). In the wizard that opens, first enter the name of your future machine. Please note that when you select a name from the list, the operating system is often automatically detected, but the version type may remain 32-bit by default.
☑️ Check before creating a VM
The key moment comes at the stage of choosing the type and version of the OS. In the dropdown list Version (Version) options with the ending (64-bit) should appear. If you only see 32-bit options, go back to checking the BIOS. Select the version you want, e.g. Ubuntu (64-bit) or Windows 10 (64-bit).
Next, you need to allocate resources. For 64-bit systems the requirements are higher. It is recommended to allocate at least 4 GB of RAM if the RAM capacity of the host allows. It is better to choose the format for your hard drive VDI and storage type Dynamicso that the file takes up space only as it is filled with data.
| Parameter | Minimum (32-bit) | Recommended (64-bit) | Comfort (64-bit) |
|---|---|---|---|
| RAM | 1 GB | 4 GB | 8 GB |
| CPU cores | 1 | 2 | 4 |
| Video memory | 16 MB | 64 MB | 128 MB |
| Disk space | 16 GB | 40 GB | 80 GB+ |
Complete the wizard and go to Settings created machine. In the section System make sure the chipset is installed in PIIX3 or ICH9, and at point Enable EFI is checked if you are installing a modern OS (Windows 11 or new Linux distributions require EFI).
Resolving conflicts with Hyper-V and other hypervisors
If you are working in an environment Windows 10 or Windows 11, a port conflict is likely. Hyper-V hijacks virtualization instructions without allowing VirtualBox use them directly. This leads to the fact that even with VT-x enabled in the BIOS, the guest system will not start or will be limited to 32 bits.
You can use the command line to solve the problem. Click Win + R, enter cmd and run as administrator. Enter the command to disable the hypervisor:
bcdedit /set hypervisorlaunchtype offAfter running the command, be sure to restart your computer. If this doesn't help, check the included Windows components. Go to Control panel → Programs and components → Turn Windows features on or off. Make sure the checkboxes are unchecked Hyper-V, Virtual machine platform and Windows Sandbox.
There is also an alternative path through the registry, but it is rarely needed. If the standard methods do not work, check if Android emulators (BlueStacks, Nox) are installed, which may also block access to the virtualization API.
Performance tuning and acceleration
After successfully launching a 64-bit system, it is important to optimize its operation. The default virtual machine does not use all the capabilities of your video adapter. To fix this, go to Settings → Display. Increase the slider Video memory to the maximum (usually 128 MB) and be sure to check the box Enable 3D acceleration.
The critical step is installation Guest Additions. This is a set of drivers and utilities that is installed inside the guest OS. Without it, the screen resolution will be low and the shared clipboard will not work. From the operating machine menu, select Devices → Mount the Guest OS Additions disk image.
⚠️ Attention: On a Linux guest system, installing add-ons may require superuser rights and a compiler. Use the command
sudo apt install build-essential dkms linux-headers-$(uname -r)before starting the installer.
For the processing power in the section System → Processor you can increase the number of cores. However, you should not give all the cores to the virtual machine; leave at least one core for the host system, otherwise the computer will start to slow down.
Common errors when working with 32-bit and 64-bit systems
Even with correct settings, specific errors may occur. Code VERR_VMX_MSR_ALL_VMX_DISABLED indicates that virtualization is disabled in the BIOS or blocked by an antivirus. Code VERR_NEM_NOT_AVAILABLE often indicates that VirtualBox Tries to use the Windows API (NEM) but encounters a driver conflict.
If the guest OS boots but is slow, check the status VT-x/AMD-V in the window Help → About the program in VirtualBox itself. There should be a green tick there. If the red cross is on, it means that hardware acceleration is not working and emulation is done in software, which is extremely slow.
Use a dynamically sized VDI virtual disk format. This will allow the file to occupy only the actual used space on the physical disk, and not the entire allocated volume at once.
Network problems are also common. If the Internet in the virtual machine does not work, go to Settings → Network and change the connection type from PCnet on Intel PRO/1000 MT Desktop. This network card emulator is most compatible with modern operating systems.
Compatibility of old and new operating systems
One of the main reasons for using 32-bit virtual machines is to run legacy software. Old programs written for Windows 98 or Windows XP, may not work correctly on 64-bit hosts. Virtualization makes it possible to isolate such environments. For such systems, select the type x86 and don't try to force 64 bits unless absolutely necessary.
On the other hand, modern systems such as Windows 11, require not only a 64-bit processor, but also the presence of a module TPM 2.0. In new versions VirtualBox (7.0+) TPM emulation appeared. In the virtual machine settings in the section System → Motherboard You can enable security chip emulation, which will allow you to install the latest OS from Microsoft.
Main conclusion: The success of running a 64-bit guest OS depends on three factors: virtualization is enabled in the BIOS, the absence of a conflict with Hyper-V, and the correct choice of OS type when creating the machine.
Don't forget that 32-bit systems have a memory addressing limit - they don't see more than 4 GB of RAM. Therefore, for resource-intensive tasks it is always preferable to create 64-bit environments if the software allows it.
FAQ: Frequently asked questions
Is it possible to run a 64-bit system on a 32-bit processor via VirtualBox?
No, this is physically impossible. If your processor does not support 64-bit (x86-64), no program settings will help you run a 64-bit guest OS. Emulation of this level would require enormous resources and is not implemented in VirtualBox.
Why does VirtualBox write an error when starting, although everything worked before?
A common cause is a Windows update that may have automatically enabled Hyper-V components or the Virtual Machine Platform. The problem may also be a BIOS update that reset the virtualization settings to the default state.
What network type is best for a virtual machine?
Suitable for easy Internet access NAT. If you need the virtual machine to be visible on the local network as a separate device, use Network Bridge (Bridged Adapter).
Do I need to uninstall the 32-bit version of VirtualBox before installing the 64-bit version?
Yes, versions may conflict. It is recommended to completely remove the old version via the Control Panel, clean the registry (optional) and install the current 64-bit distribution from the official website.