FIX: USB COM Port (COM4) Driver


If you have landed on this page then it is highly likely you are having problems with your USB COM Port (COM4) drivers and are experiencing an error similar to this one:

Driver Error - USB COM Port (COM4)

Error Icon

Unable to start program due to the USB COM Port (COM4) driver being missing from your computer. Try reinstalling the program to fix the problem.

Drivers are an important part of your Microsoft Windows operating system and allow it to communicate with devices such as printers and graphics cards.

What is a driver?

A driver is essentially a collection of files that your Windows operating system uses in order to understand how hardware works.

When you connect a new device through USB for example Windows will quickly try to establish what it is.

Sometimes Windows will be able to recognize right away what it is and how it can interact with it, allowing software (such as programs and video games) to access its features.

Often you may find that a new device simply isn’t recognized straight away and so you need to find the correct “drivers” to make the link.

You can download these as an installable .exe file that has everything in it ready-to-go, you just double click and follow the instructions on the screen.

How to fix ZyXEL USB COM Port (COM4) driver issues?

Luckily you have several options if you want to fix the missing USB COM Port (COM4) driver problem your computer is experiencing.

  1. The manual method – searching online for the correct version from the manufacturer
  2. Have a program install it for you and take care of future driver updates
  3. Look for the disk that came with the device that will have an older driver on

1. Search online for the correct and most recent driver executable

Google Search ExampleDoing a simple Google search for the USB COM Port (COM4) drivers will probably eventually lead you to the devices page on the manufacturer’s website.

On this page, you are likely to see a link to the drivers available for this device along with versions and the date of their release.

You are most likely going to want to try out the most recent release first to see if that works with your copy of Windows and then work backward.

If you want to skip this trial and error and have this done for you by a program then move onto the second method below.

2. How to install the driver automatically?

The easiest and most hassle-free way of fixing any of your missing USB COM Port (COM4) driver errors is to use a tool like Outbyte’s Driver Updater.

This program can easily and quickly search for the missing driver and install it correctly with almost zero input from you.

It works sort of like an anti-virus, it scans your computer and detects any missing drivers (some you may not even realize you are missing!) then downloads and applies the latest version.

Luckily the company offers a 7-day free trial of the software which is plenty of time to fix your missing driver issue and see if the program is worth paying for.

You can use the link below to check that it works with your version of Windows and then proceed to download it.

Download Now

See more information about Outbyte and uninstall instructions. Please review Outbyte EULA and Privacy Policy

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With:

Windows Versions
Laptop Running Driver Scan

Click "Download Now" to get the PC tool that comes with the USB COM Port (COM4) drivers. The utility will determine missing drivers and offer to install them automatically. Being an easy-to-use utility, it is a great alternative to manual installation, which has been recognized by many computer experts and computer magazines. Limitations: trial version offers an unlimited number of scans, backup, restore of your windows registry for FREE. Full version must be purchased. It supports such operating systems as Windows 10, Windows 8 / 8.1, Windows 7 and Windows Vista (64/32 bit).

3. Install the USB COM Port (COM4) driver from the disk that came with the device

A Pack of Disks SavedWhen you purchased your ZyXEL USB COM Port (COM4) you should have got a disk in the box/packet that it came in.

On this disk (most probably a CD) you should find an installable file that contains the latest driver at the time of purchase.

Chances are though, that this is drastically out of date and for security reasons you should probably seek the newest version as possible online.

The company may have found issues with the device or how it interacts with newer versions of Windows and then patched them.


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