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To disable auto-tuning, follow these steps:
Click Start, click All Programs, and then click Accessories.
Right-click Command Prompt, and then click Run as Administrator. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
At the command prompt, type the following command, and then press ENTER:
netsh interface tcp set global autotuninglevel=disabled
This command disables the Receive Window Auto-Tuning feature.
Close the Command Prompt window.
Restart the computer.