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Other Windows device drivers - Amazon Elastic Compute Cloud
Supported instancesSupported operating systemsDriver installation

Other Windows device drivers

The AWS VMClock device is a virtual clock device that is present on Nitro-based instances. The device appears in Device Manager under System devices as AWS VMClock Device. AWS provides a null (no-function) driver package for Windows that allows the operating system to recognize the device.

Supported instances

The AWS VMClock device is available on Nitro-based instance types. For a list of Nitro-based instance types, see Nitro-based instances.

Supported operating systems

The driver package supports the following versions of Windows Server:

  • Windows Server 2016

  • Windows Server 2019

  • Windows Server 2022

  • Windows Server 2025

Driver installation

If the AWS VMClock device shows a warning icon in Device Manager, which indicates that no driver is installed, you can install the null driver package manually.

To install the AWS VMClock driver

  1. Download and extract the driver package from Amazon S3.

    Invoke-WebRequest https://s3.amazonaws.com/ec2-windows-drivers-downloads/AWSVMClock/Latest/AWSVMClock.zip -OutFile $env:USERPROFILE\AWSVMClock.zip
Expand-Archive $env:USERPROFILE\AWSVMClock.zip -DestinationPath $env:USERPROFILE\AWSVMClock

  2. Install the driver using pnputil.

    pnputil /add-driver $env:USERPROFILE\AWSVMClock\aws_vmclock.inf /install

  3. Verify the device status in Device Manager. You don't need to reboot the instance.