VT is a processor setting you enable in BIOS before virtualization software can work

VT (virtualization technology) is a feature built into most modern processors that lets your computer run virtual machines — separate operating systems inside your main one. It does not turn on by default. You have to enable it yourself in BIOS, the firmware that runs before your operating system loads. Without VT enabled, virtualization software like VirtualBox, Hyper-V, or KVM will either refuse to start or run very slowly.

The steps are the same across most computers: restart, enter BIOS during startup, find the virtualization setting (the name varies by manufacturer), turn it on, and save. The whole process takes five to ten minutes. If you are not comfortable in BIOS, the hardest part is finding where the setting lives — the location and name change depending on whether you have an Intel or AMD processor and which motherboard manufacturer made your BIOS.

Key Takeaways

  • You must restart your computer and enter BIOS before Windows or your operating system loads to enable VT.
  • The setting is usually called Intel VT-x, Intel Virtualization Technology, AMD-V, or SVM, depending on your processor and motherboard.
  • The location in BIOS menus varies widely — check your motherboard manual or search for your specific model to find the exact path.
  • After you enable VT and save, your virtualization software should recognize it immediately without needing to restart again.

How to enter BIOS on your computer

To enter BIOS, you must press a specific key while your computer is starting up, before the operating system loads. The key depends on your computer's manufacturer. On most desktops and laptops, it is Delete, F2, F10, or F12. Some Lenovo machines use Novo Button (a small physical button on the side). Dell, HP, Asus, and Acer each have their own defaults, though many let you press multiple keys and one will work.

The safest approach: restart your computer, and as soon as you see the first screen (the manufacturer logo or a black screen with text), start pressing the key repeatedly — do not hold it down, tap it several times per second. You will either enter BIOS or see a menu that lets you choose to enter BIOS. If nothing happens after ten seconds, restart and try a different key. Your motherboard manual or the manufacturer's support page for your exact model will confirm which key is correct.

Finding the virtualization setting in BIOS

Once you are in BIOS, the virtualization setting is usually in a menu called Advanced, Processor, CPU, Chipset, or Security. It will not be on the main screen. Use the arrow keys to navigate — the mouse does not work in BIOS. Look for a setting named one of these:

  • Intel VT-x (Intel processors)
  • Intel Virtualization Technology (Intel processors)
  • AMD-V (AMD processors)
  • SVM (AMD processors)
  • Virtualization (generic name, less common)

If you cannot find it after checking Advanced and Processor menus, search online for "[your motherboard model] enable VT" or "[your computer model] enable virtualization". Motherboard manufacturers like ASUS, Gigabyte, MSI, and ASRock each organize BIOS differently, and the manual will show you the exact menu path. Laptop manufacturers like Dell, HP, and Lenovo also vary — a quick search for your model usually returns a screenshot showing where to look.

Enabling VT and saving your changes

When you find the virtualization setting, it will show a value like Disabled or Off. Press Enter to open it, then select Enabled or On. The exact wording depends on your BIOS version. After you change it, navigate to the Save and Exit menu (usually at the bottom of the BIOS screen or in a main menu). Press Enter and confirm that you want to save changes. Your computer will restart automatically.

Do not change any other settings unless you know what they do — BIOS controls low-level hardware behavior, and changing the wrong thing can prevent your computer from starting. If you accidentally change something else, you can usually press Escape to go back without saving, or look for a Reset to Defaults option in the main BIOS menu.

Checking that VT is actually enabled

After your computer restarts and your operating system loads, you can verify that VT is on. On Windows, open PowerShell as administrator and run this command:

Get-WmiObject Win32_Processor | Select-Object Name, VirtualizationFirmwareEnabled

If VirtualizationFirmwareEnabled shows True, VT is on. If it shows False, VT is still disabled in BIOS — go back and check that you saved the change correctly. On Linux, run grep vmx /proc/cpuinfo (Intel) or grep svm /proc/cpuinfo (AMD). If you see output, VT is enabled. If you see nothing, it is still off.

What to do if you cannot find the setting

Some older computers and budget laptops do not have VT, or the manufacturer disabled it and did not expose the option in BIOS. Check your processor's specifications on Intel's or AMD's website — search for your processor model and look for VT-x (Intel) or AMD-V in the feature list. If your processor does not support it, virtualization software will not work on your machine.

If your processor supports VT but the BIOS option is missing, the setting may be locked by the manufacturer. Some business laptops and pre-built computers lock BIOS settings to prevent changes. In that case, you may need to contact the manufacturer's support to unlock it, or check whether a BIOS update is available that exposes the option. Updating BIOS is risky and should only be done if you are confident in the process — a failed update can make your computer unbootable.

Common issues after enabling VT

After you enable VT, virtualization software should recognize it immediately. If your software still says VT is not available, restart your computer — sometimes the change does not take effect until a full restart after exiting BIOS. If restarting does not help, double-check that you actually saved the BIOS change (look for a confirmation message when you exited) and that you enabled the correct setting for your processor type.

Some antivirus software and Windows Defender can interfere with virtualization. If your software starts but runs slowly or crashes, check your antivirus settings for an option to allow virtualization or disable real-time protection temporarily while you test. Hyper-V on Windows can also conflict with other virtualization software — if you are using VirtualBox or VMware, make sure Hyper-V is turned off in Windows Features.

Frequently Asked Questions

Is it safe to enable VT in BIOS?

Yes. VT is a standard processor feature designed to be enabled. Turning it on does not affect your computer's stability or security. It only becomes active when you actually run virtualization software — it does not change how your main operating system works.

Will enabling VT slow down my computer?

No. VT has no performance impact when you are not running a virtual machine. Once you start a virtual machine, the virtual machine itself will use CPU and memory, but that is expected — VT just makes the virtualization more efficient.

What if I enable VT but my virtualization software still does not work?

Restart your computer after enabling VT — the change sometimes does not take effect until a full restart. If that does not work, verify VT is actually on using the PowerShell or Linux commands above. If VT shows as enabled but your software still fails, check whether you have Hyper-V or another virtualization platform already running, which can block other software.

Can I disable VT after I enable it?

Yes. Go back into BIOS, find the same setting, change it back to Disabled, and save. You might want to do this if you are troubleshooting a conflict with antivirus software or another application, though most people leave it on once it is working.

Do I need to enable VT if I am just using my computer normally?

No. VT is only needed if you plan to run virtual machines. If you never use VirtualBox, Hyper-V, KVM, or similar software, you do not need to enable it.