Windows 64-bit Fix for:
- All Windows 64-bit operating systems including Windows 10 
.Prolific USB to Serial Adapter OR other device. 
.Device using PL-2303 H, HX, HXA, HXD, X, XA, EA, RA, SA, TA, TD version chips
.Driver Version: 3.3.2.102
.Driver Date: 09/29/08
.Supported device ID and product strings: . VID_067B&PID_2303 for "Prolific USB-to-Serial Comm Port"

1. Download and Save the "PL2303_64bit_ Installer.exe" at the link below: 

http://www.ifamilysoftware.com/Drivers/PL2303_64bit_Installer.exe

You can just Save it to your Desktop to make it easier. Norton's 360 won't like it, so to save all the grief of dealing with that beast you might want to disable your anti-virus before running the installer.

2. Unplug all USB-To-Serial adapters and Double click on the installer "PL2303_64bit_Installer.exe"

3. When it prompts you, plug in one (1) of your USB-To-Serial adapters and click "Continue".

4. Reboot your computer.

5. Unplug the adapter and plug back in again. That's it!

Trouble Shooting: You must follow ever step in the process precisely. If you still receive an error after running the PL-2303_64bit_Installer.exe and your device is plugged in, go to the Windows Device Manager. Scroll down to Ports (Com & LPT) and Double-Click on "Prolific USB-to-Serial Comm Port (COM#)". In the Properties Window, Click on "Driver". The "Driver Version" must say "3.3.2.102" dated 09/24/08. If not, then the correct driver is not installed. Unplug the USB-To-Serial adapter and run the "PL2303_64bit_Installer.exe" again, following the directions precisely until you get it right. 

Removal: There is no "Uninstaller" for this file. The installer itself is just an executable ".EXE" file that can be deleted when you are done. Any additional files that it uses are temporary only and are stored in the "C:\Windows\Temp" folder.

Windows 32-bit Fix for:
- All Windows 32-bit operating systems from XP up
.Prolific USB to Serial Adapter . 
.Device using PL-2303 H/HXA/HX/X version chips 
.Driver Version: 2.0.2.8
.Driver Date: 11/20/07
.Supported device ID and product strings: . VID_067B&PID_2303 for "Prolific USB-to-Serial Comm Port"

1. Download and Save the "PL-2303_Driver_ Installer.exe" program at the link below: 

http://www.ifamilysoftware.com/Drivers/PL-2303_Driver_Installer.exe

You can just Save it to your Desktop to make things easy.

2. Run the installer program. If it offers a choice to remove the driver, then select to remove the current "bad" driver. Then run the installer again to install the correct driver. 

Trouble Shooting: If you still receive an error after running the PL-2303_Driver_Installer.exe and your device is plugged in, go to the Windows Device Manager. Scroll down to Ports (Com & LPT) and Double-Click on "Prolific USB-to-Serial Comm Port (COM#)". In the Properties Window, Click on "Driver". The "Driver Version" must say "2.0.2.8" dated 11/20/07. If not, then the correct driver is not installed. Unplug the USB-To-Serial adapter and run the "PL2303_Driver_Installer.exe" again, following the directions precisely until the correct driver appears in the Device Manager.

Removal: The Prolific 32-bit PL-2303_Driver_Installer is a "Program" file and therefore installed to your computer and must stay. If you want to delete it, use the Windows "Uninstall a Program" or "Add or Remove Program" feature, however this will also uninstall the driver itself.