Mmm,

Well I installed the driver:
Prolific USB-Serial Com Port (COM3)
However it says:
This device cannot start. (Code 10)
And code 10 from M-SOFT says:

Code 10

If the device has a FailReasonString value in its hardware key, that string is displayed as the error message. The driver or enumerator puts this registry string value there. If there is no FailReasonString in the hardware key, you receive the following error message:
This device cannot start. (Code 10)
Recommended resolutions

Here are some things that you can try to resolve this problem.

Update the driver

In the device Properties dialog box, click the Driver tab, and then click Update Driver to start the Hardware Update Wizard. Follow the instructions to update the driver.

You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s Web site.
I've deleted and re-installed it, same outcome and checked for a later driver, same outcome.

What's meant to happen here then mackrackit, is the USB-Serial meant to work through the Serial Communicator or via it's own application?

Dave