Open the Start Menu, right-click Computer, and select Manage. Click Device Manager in the left sidebar. Look under Other Devices or Ports (COM & LPT).
If the device doesn't appear in Device Manager at all, try a different USB port or cable, as these adapters frequently suffer from internal wire breakage.
This is common with Prolific drivers. It usually means the driver is too new for an older hardware revision. Try rolling back the driver in Device Manager. download usb serial converter driver windows 7
Before downloading anything, you must know which hardware chip is inside your adapter. Most USB-to-Serial cables use one of three major brands. To check this: Plug the device into your USB port.
If you'd like to troubleshoot a specific error, let me know: Open the Start Menu, right-click Computer, and select Manage
Prolific adapters are very common but prone to "Code 10" errors if you use a counterfeit chip or the wrong driver version.
Prolific provides a "PL2303 Windows Driver Installer" on their support page. If the device doesn't appear in Device Manager
Plug the adapter back in. Windows 7 should now recognize the device and assign it a COM port number (e.g., COM3). Troubleshooting Common Issues
