Hardware⏱️ 4 min read📅 2026-06-11

How to Fix: Virtualbox and getting the Locked VT-x Error when trying to use more than 1 processor on the session

Virtualbox error with locked VT-x feature, unable to use multiple processors in a session.

Quick Answer: Check if your CPU supports Intel VT-x and ensure it's enabled in the BIOS settings.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🛠️ Step-by-Step Verified Fixes
  3. ✨ Wrapping Up

The 'VT-x features locked or unavailable in MSR' error occurs when VirtualBox is unable to utilize multiple processors on a single session. This issue affects users with Intel-based systems, particularly those using AMD Ryzen or Core i7 processors. The error can be frustrating as it prevents users from utilizing the full potential of their processor.

This problem arises due to the lack of VT-x support in the system's BIOS or the operating system itself. Fortunately, there are steps that can be taken to resolve this issue and enable multiple processor usage on VirtualBox sessions.

🔍 Why This Happens

  • The primary reason for this error is the absence of VT-x support in the system's BIOS. VT-x (Intel Virtualization Technology Extensions) is a feature that allows virtual machines to utilize multiple processors, improving performance and efficiency. If VT-x is not enabled in the BIOS, VirtualBox will not be able to use it, resulting in the 'VT-x features locked or unavailable in MSR' error.
  • Another possible reason for this issue is the presence of an AMD Ryzen processor, which does not support VT-x by default. While some Ryzen processors may have VT-x enabled through a separate chip, others do not. In such cases, VirtualBox will not be able to utilize multiple processors on a single session.

🛠️ Step-by-Step Verified Fixes

Enabling VT-x in the BIOS

  1. Step 1: Open the BIOS settings by pressing the key indicated during boot (usually F2, F12, or Del). This may vary depending on the specific motherboard model.
  2. Step 2: Navigate to the advanced or overclocking section of the BIOS settings. Look for options related to VT-x or Virtualization Technology Extensions.
  3. Step 3: Enable VT-x and save the changes. Make sure to set a boot order that prioritizes the virtual machine's boot device (usually CD/DVD) over the primary hard drive.

Installing an AMD Ryzen processor with VT-x support

  1. Step 1: Research the specific model of your motherboard and determine which one supports VT-x. Some popular processors that have VT-x enabled include Intel Core i7 and i5 models.
  2. Step 2: Purchase a new processor that has VT-x support, if necessary. Ensure that the processor is compatible with your system's socket type (e.g., LGA 1151 for Intel Core i7).

✨ Wrapping Up

To resolve the 'VT-x features locked or unavailable in MSR' error in VirtualBox, it is essential to enable VT-x in the BIOS settings or install an AMD Ryzen processor with VT-x support. By following these steps, users can utilize multiple processors on a single session and improve overall system performance.

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