Intel 21140-Based PCI Fast Ethernet Adapter (Emulated) Driver

The Intel 21140-Based PCI Fast Ethernet Adapter (Emulated) driver lets Windows communicate with a virtual Ethernet adapter presented by compatible virtualization software. This Microsoft-provided network driver is intended for users whose virtual machine lists this device in Device Manager and needs working network access or help resolving a missing-driver warning.

Key Features

• Support for emulated Ethernet hardware: Connects Windows to the Intel 21140-based virtual network adapter rather than a physical PCI network card.
• Guest network connectivity: Enables the adapter to carry network traffic, with internet and local network access depending on your virtual machine’s network settings.
• Windows network integration: Works with Windows networking components so you can configure IP addresses, DNS servers, and other connection settings.
• Legacy guest compatibility: Intended for matching configurations running Windows 10, 8.1, 7, Vista, or XP. Package availability and compatibility can vary by Windows edition and architecture.

How to Install Intel 21140-Based PCI Fast Ethernet Adapter (Emulated) Driver

1. Confirm the adapter model. Open Device Manager in the virtual machine and check Network adapters or Other devices. Verify that the device name matches; if it is unidentified, check its hardware IDs under Properties > Details.
2. Check your Windows version. Confirm whether the guest operating system is 32-bit or 64-bit. For Windows 10/11 environments, distinguish between the host and guest OS: this driver must match the guest, and Windows 11 support is not established by the supported OS list above.
3. Choose a compatible package. Before selecting an Intel 21140-Based PCI Fast Ethernet Adapter (Emulated) driver download for Windows, verify the supported operating systems and source. Prefer Windows Update or an official Microsoft source for a free download, and choose the latest version compatible with your guest.
4. Install the driver. If the package includes an installer, follow its instructions. For extracted driver files, right-click the adapter in Device Manager, select Update driver, and browse to the folder containing the matching INF file.
5. Restart and test. Restart the guest if prompted, then check Device Manager and test connectivity. If the adapter works but cannot reach the network, review the virtualization software’s virtual switch, NAT, or bridged-network settings.

Keep the driver updated through trusted sources, but prioritize compatibility over a higher version number. Before an update, create a virtual machine checkpoint or backup where available so you can restore a working configuration if needed.