Because the network chip is manufactured by Intel, you can also use generic Intel drivers. Intel Network Adapter Driver for Windows 7

: Use the Dell Support site and click Download next to the "Intel 825xx Gigabit Platform LAN Network Device".

3. Driver Appears with a Yellow Exclamation Mark in Device Manager

The Dell OptiPlex 790 uses an integrated controller. The safest, best, and completely free source is the official Dell Support ecosystem. Official Download Details Developer: Intel / Dell Inc. Supported OS: Windows 7 (32-bit and 64-bit)

Dell Optiplex 790 Network Drivers Windows 7 Free Download Best

Download the driver from the link above (save it, but don't run it). Right-click and select Manage . Go to Device Manager .

Network drivers are essential for your computer to communicate with other devices on a network. Without the correct drivers, you might experience issues like:

Select from the Operating System dropdown menu. Expand the Network category.

Ultimate Guide to Dell OptiPlex 790 Network Drivers for Windows 7

If you see a yellow triangle or an "Unknown Device" listing: Right-click the unknown device. Select . Choose Browse my computer for driver software .

Are there other showing up in your Device Manager?

Remember: The best driver is the one that is signed, stable, and specifically compiled for your motherboard revision. Stick with Dell’s official versions 25.5 (Intel) or 7.92 (Realtek), and your OptiPlex 790 will continue serving you reliably on Windows 7 for years to come.

Before tackling the network driver, it's a good practice to install the latest Intel Chipset driver. This driver is available on the Dell Support site and is designed for Windows 7 (32/64-bit) systems.

If you are doing a clean install, you can download the . This is a massive file containing all drivers for the machine, which you can extract and point the Device Manager to.

Dell maintains a legacy repository for the OptiPlex 790. This is the safest and best source for your download. Navigate to the official .

If the executable installer fails or throws an error, install the raw driver files manually:

Transfer the downloaded .exe file to the OptiPlex 790 using a USB drive. Key Driver Details Intel 82579LM Gigabit Ethernet Driver Type: Network Adapter Driver Compatibility: Windows 7 64-bit, Windows 7 32-bit Source: Official Dell Support