Try the suggestion posted by Repsej on this thread: https://answers.microsoft.com/en-us/windows/forum/windows\_7-hardware/driver-problem-with-prolific-usb-to-serial/0e4967f9-1367-4012-90ba-40c75107f9e0?auth=1

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Plugable
kb.plugable.com โ€บ serial-adapter โ€บ installing-the-plugable-usb-to-rs-232-db9-serial-adapter-on-windows-7
How to Install the Plugable USB to RS-232 DB9 Serial Adapter on Windows 7 - Plugable Knowledge Base
March 4, 2026 - The Plugable USB to Serial adapter (PL2303-DB9) can be installed on Windows 7 by downloading the recommended Prolific driver, running the installer, and then connecting the device.
Discussions

Installing an rs232 to USB driver on Windows 7
I cannot get Windows 7 to recognize a rs232 to USB converter. It works perfectly on Windows XP on another computer so I would assume the the driver is not correct ot installed correctly. The device is recognized when plugged in but does not function โ€ฆ More on learn.microsoft.com
๐ŸŒ learn.microsoft.com
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164
Installing an rs232 to USB driver on Windows 7
I cannot get Windows 7 to recognize a rs232 to USB converter. It works perfectly on Windows XP on another computer so I would assume the the driver is not correct ot installed correctly. The device is recognized when plugged in but does not function โ€ฆ More on answers.microsoft.com
๐ŸŒ answers.microsoft.com
1
164
USB to RS232 on windows 7 Issue - Windows - Spiceworks Community
My client had windows XP machines, configured with SBS2003 - he then decided to upgrade to windows professional. On the original machine there are two serial ports, and on the new one only one. So, I used a USB to RS232 Adapted which seemly is not working with WIN7, every time it pops up ... More on community.spiceworks.com
๐ŸŒ community.spiceworks.com
8
August 23, 2013
USB to serial adapter driver
Look in Device Mangler in the device properties and get the hardware ID. Then Google that, and it should point you at the adapter or chipset mfgr's website, to download the driver. For future though, just buy one based on an FTDI chip and it'll plug and play in Windows. Other common chips will too, but FTDI seems to be the most reliable in operation. More on reddit.com
๐ŸŒ r/PLC
10
3
March 26, 2025
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Microsoft
catalog.update.microsoft.com โ€บ Search.aspx
Microsoft Update Catalog
We cannot provide a description for this page right now
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USBFireWire
usbfirewire.com โ€บ parts โ€บ rr-usb-017.html
USB to Serial Adapter (RS232) -Windows 7 โ€“ 877-522-3779 โ€“ USBFireWire.com
USBFireWire USB to Serial Adapter (RS232) -Windows 7
This item has reached the end of it's life and is no longer available.ย  However, we realize that this information will still serve to help troubleshoot existing devices. Guaranteed Compatibility Windows 7 Compatible 32-bit and 64-bit Fully Serial / RS232 compatible We proudly boast about our 99% device compatibility ratio with this product! We also stand behind it. You may see others that look like ours, but ours comes with a driver for Windows 7, 32-bit as well as 64-bit. Commercial quality Our USB to Serial Adapter Cable is used mainly by AV pros and other industrial techs. This cable works
Price ย  $17.00
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Tri-plc
tri-plc.com โ€บ USB-RS232 โ€บ drivers.htm
USB-RS232 Serial Converter Driver Download
Windows 7 64-bit & 32-bit, Windows Vista 64-bit & 32-bit, Windows XP, Windows 2000, Windows Me, Windows 98 ยท Important note regarding Windows 7 and Vista: The driver MUST be installed "as Administrator" Right-click the downloaded EXE file and choose Run as administrator
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US Converters
usconverters.com โ€บ index.php
USB to RS232 Driver | USB Serial Driver Downloads and Tools : U.S. Converters LLC, Serial Data Communication
USB to serial drivers are designed to be compatible with a wide range of operating systems, including Windows 11, Windows 10 Windows 8, Windows 7, Windows Server, and Windows CE. This broad compatibility ensures that users can connect their serial devices to both modern and legacy systems without ...
Find elsewhere
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Soft Famous
softfamous.com โ€บ usb-to-rs232-driver
USB to RS232 Driver Download Free for Windows 7, Windows Vista, Windows XP (64 bit / 32 bit)
December 29, 2020 - Download USB to RS232 Driver (2026) from SoftFamous. 100% Safe and Secure. Free Download .
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Usbfirewire
www2.usbfirewire.com โ€บ Parts โ€บ rr-usb-017.html
USB to Serial Adapter (RS232) -Windows 7 - USB A Male to DB9 Male - Download Windows 7 Driver Here - USBFireWire.com - 877-522-3779
USB to Serial Adapter (RS232) -Windows 7 USB A Male to DB9 Male - Download Windows 7 Driver Here ยท Guaranteed Compatibility Windows 7 Compatible 32-bit and 64-bit Fully Serial / RS232 compatible We proudly boast about our 99% device compatibility ratio with this product!
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USB Driver Download
usb-drivers.org โ€บ home โ€บ usb to rs232 driver
USB to RS232 Driver | USB Driver
October 24, 2023 - This is the USB to RS232 driver for the USB adapter. In order to setup the driver you need to download the correct USB driver file and run the installer.
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OEM Drivers
oemdrivers.com โ€บ usb-to-rs232-drivers
USB to RS232 Driver | OEM Drivers
August 29, 2024 - Drivers are required for a USB to RS232 adapter to function on Windows OS. Which drivers are needed to be installed will depend on the chipset that is used in the adapter, and there are several including Prolific, FTDI and others.
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Microsoft
catalog.update.microsoft.com โ€บ Search.aspx
USB to RS232 driver
We cannot provide a description for this page right now
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Driverscape
driverscape.com โ€บ download โ€บ rs-232-port
RS-232 Port Drivers Download for Windows 10, 8.1, 7, Vista, XP
Use the links on this page to download the latest version of RS-232 Port drivers. All drivers available for download have been scanned by antivirus program.
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Super User
superuser.com โ€บ questions โ€บ 735504 โ€บ installation-of-usb-to-rs232-driver-fails
windows 7 - Installation of USB-to-RS232 driver fails - Super User
From the link posted: "Please be warned that counterfeit (fake) PL-2303HX (Chip Rev A) USB to Serial Controller ICs using Prolific's trademark logo, brandname, and device drivers, were being sold in the China market. Counterfeit IC products show exactly the same outside chip markings but generally are of poor quality and causes Windows driver compatibility issues (Yellow Mark Error Code 10 in Device Manager).
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Bridgemate
support.bridgemate.com โ€บ en โ€บ support โ€บ solutions โ€บ articles โ€บ 44001826937-windows-7-8-8-1-64-bit-driver-for-usb-serial-converter-for-bridgemate-pro-server
Windows 7/8/8.1 64-bit driver for USB-serial converter for Bridgemate Pro server : Bridgemate Support Center
October 11, 2021 - This article describes the procedure for downloading and installing version 3.1.0.0 of the Bridgemate Pro server USB-serial converter for 64-bit versions of Windows 7 and Windows 8. Version 3.1.0.0 of the Aten USB-serial converter driver has been ...
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Gallagher
search.am.gallagher.com โ€บ global โ€บ support โ€บ software-downloads โ€บ usb-drivers-v111
USB Drivers (v1.11)
Having problems downloading? Try downloading via FTP ( Select Internet Explorer as the preferred application)
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Spiceworks
community.spiceworks.com โ€บ windows
USB to RS232 on windows 7 Issue - Windows - Spiceworks Community
August 23, 2013 - My client had windows XP machines, configured with SBS2003 - he then decided to upgrade to windows professional. On the original machine there are two serial ports, and on the new one only one. So, I used a USB to RS232 Adapted which seemly is not working with WIN7, every time it pops up ...
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Optilab
optilab.com โ€บ blogs โ€บ software โ€บ usb-to-rs232-driver
USB to RS232 Driver โ€“ Optilab
May 10, 2023 - Click Here to download the Legacy (prior to Win10) USB to RS232 drivers. Click Here to download the USB to RS232 drivers (x64) Click Here to download the USB to RS232 drivers (x86)