To get your LAN working on Windows 7, you should download the driver for the Network Controller/Chipset provided by your motherboard or laptop manufacturer. Microsoft Learn Recommended Download Sources Manufacturer Website (Best Option):

: High-reliability drivers used for ThinkPad/ThinkCentre systems available on Lenovo Support Intel Desktop Board Drivers OS Support : Windows 7 (32-bit and 64-bit) : If you are using an Intel board (like D425KT), use the Official Intel Ethernet Driver How to Install the Driver the "Auto Installation Program" from the links above. the ZIP file to a known folder on your hard drive. file as an Administrator. Follow the prompts in the installation wizard and your computer when finished to complete the setup. How to Verify Installation Device Manager (Right-click "Computer" > Properties > Device Manager). Network adapters Double-click Realtek PCIe GBE Family Controller Realtek Fast Ethernet Controller to verify the driver version and status. motherboard model to find the exact manufacturer-specific driver?

Download version 7.118 directly from your motherboard vendor or the official Realtek archive. Avoid "driver finder" tools. That is the top safe method for getting your Realtek RTL8201CL LAN working on Windows 7 today.

: If you are using a Lenovo device, such as a ThinkPad or ThinkCentre, dedicated drivers are available on the Lenovo Support Portal Intel Desktop Boards

✅ Realtek PCIe GBE Family Controller driver v7.147 (or higher) from Realtek’s website.