The latest driver installed by Windows (Vista, 7, 8.1 and 10) is not compatible with these chips. The last compatible Prolific driver was v3.3.2.105. Windows may attempt to automatically load the Prolific driver 3.6.xx.xxx when inserting your cable. The device works fine on another laptop. It's as if I mistakenly turned off my Comm Ports or something. The Prolific USB-to-Serial Comm Port remains greyed out. I tried Add New Hardware and installing the (new) Prolific drivers - nothing. I tried uninstalling and reinstalling every Port and USB on Device Manager - nothing.

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Serial Device Driver

Summary :

COM ports are common components of Device Manager. Windows users can see them easily by opening the Device Manager. However, problems may occur, causing the COM ports lost from Device Manager. If you are encountering this, please read the methods mentioned below to try to fix the problem yourself.

COM stands for Communication port and it is actually the original name of the serial port interface. The COM can be used to refer both physical ports and emulated ports, which are created via the Bluetooth or USB-to-serial adapters. Well, the COM ports missing in Device Manager problem happens now and then.

How to access Windows 10 Device Manager ports?

1. Right click on This PC icon on the desktop.
2. Choose Manage from the context menu.
3. Select Device Manager under System Tools. (You can also press Start + X directly to select Device Manager.)
4. Choose View from the menu bar.
5. Choose Show hidden devices from the submenu.
6. Locate Ports (COM & LPT) from the list in the right pane.
7. Expand it to find Communications Port (COM).

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COM Ports Missing in Device Manager

However, there are many peoples said they can’t find ports in Device Manager and they desperately need a solution to it.

COM Ports Not Showing in Device Manager: Ture Cases

One: Com Port is Missing / Ports Option Not Available In Device Manager.

My com port is missing. And the ports option is not available in Device Manager. I'm able to perfectly connect and use my phone/modem with the computer. I had gone through several discussions about same topic here in answers.microsoft.com to no avail. How do I enable it, or can you provide a link where I can download this com driver for windows 10? Thanks.- posted by etwdensegen sprechen in Microsoft Forum

Two: No Ports shown in Device Manager (even hidden) Win 7 Pro 64 bit.

I can't get an external modem to work (even though it shows in devices and printers window. I can't get a USB-serial port converter to work either. It would be helpful if I had info from the device manager window but nothing show up, even though I have turned on the show hidden devices. Any ideas? Thanks.- asked Paul Saacke in Microsoft Forum

Three: COM PORT is disappeared in Device Manager.

When I opened device manager at that time I found that, portable devices COM port option disappeared from device manager. What should I have to do to resolve this issue?- said SAY014 in HP Forum

Serial Com Device Drivers

So how to fix the problem and find back your Windows 10 COM ports? Download razer keyboards driver. Please keep reading!

How Do I Add a COM Port to Device Manager

Some users complained that their Widows 10 COM ports disappeared from Device Manager after they have upgraded their Windows platforms. Whatever the cause, the users’ primary concern is how to restore missing COM ports. That’s what I’m going to talk in this section.

Method 1: Show hidden devices.

As I have mentioned at the beginning of this article, users can’t see the COM ports directly. Instead, they need to open Device Manager -> select View tab -> choose Show hidden devices. After that, they’ll see the Ports (COM & LPT) option and they only need to expand it to fins COM ports.

Method 2: add COM ports manually.

1. Open Device Manager on your Windows 10 computer.
2. Click on the Action option from menu bar.
3. Choose Add legacy hardware from the submenu to open the Add Hardware window.
4. Click on the Next button to move on.
5. Check Install the hardware that I manually select from a list (Advanced) and press Next.
6. Select Ports (COM & LPT) from the given list and press the Next button.
7. Choose Standard port types option or the manufacturer for the ports; then, click Next.
8. Click on the Finish button to complete.

Method 3: update the motherboard drivers.

If the motherboard drivers are too outdated, they will also lead to COM ports missing in Device Manager. Therefore, you are advised to update your motherboard drivers manually and see whether it works.