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For Windows 7, you need the drivers from the official manufacturer, FTDI Chip. Official Source: Go to the FTDI VCP Drivers page . What to download: Look for the "Windows" row in the table.

The is essential for connecting devices that use the FT232R chip—such as Arduino Nano boards, GPS modules, and industrial equipment—to a computer. On Windows 7 , these drivers often do not install automatically, leading to a "yellow exclamation mark" in the Device Manager. Why You Need This Driver

Starting , FTDI drivers are signed with SHA-2 certificates. Windows 7 SP1 does not natively trust SHA-2.