Aug 19, 2019 After installing Windows 10 one of my existing Windows 7 COM ports disappeared. I have an Elecraft K3 radio transceiver connected to the computer which runs the DX Lab suite of software. One of the programs is DX Commander which displays frequency and other items from the radio. The port the radio had been using was COM10. Most of these computers are Windows XP (outside of the realm of this discussion). I do know for sure that, in most cases, installing a Windows 7 computer will involve a large investment in terms of the third party s/w and h/w. However, I do know that Windows 7 does support serial ports. May 15, 2016 Parallel and serial ports not working in Windows 10 (Version 1511) Hi. Since the 1511 update myself and my customers have problems with devices connected to COMx and LPTx ports. After a search I found a solution by disabling the ports and then re-enabling them and a script to run at boot time to automated the process. Apr 20, 2017 To install serial ports and COM ports using these system-supplied components, do the following: Provide an INF file that specifies the Ports device setup class and the Serial function driver as the service for the port. To configure a serial port as COM port, comply with the requirements that are defined in Configuration of COM Ports. Jan 18, 2016 Windows 10 COM Port Identification. How to determine what COM port has been assigned to you USB to Serial Device. Fix USB Ports Not Working in Windows 10.
If you only use one Plugable USB-Serial adapter on this computer, it is possible to set the registry so that Windows ignores the serial number of the adapter, and thereby assigns the same port to any Plugable adapter that is plugged in, but if you are using multiple Plugable adapters, this will make the situation worse.
For most devices, the Ports device setup class and the Serial function driver provide the functionality required to operate serial ports and COM ports. To install serial ports and COM ports using these system-supplied components, do the following:
Provide an INF file that specifies the Ports device setup class and the Serial function driver as the service for the port.
To configure a serial port as COM port, comply with the requirements that are defined in Configuration of COM Ports.
For more information about installing serial ports and COM ports using the Ports device setup class and the Serial function driver, see the following topics:
If you do a custom installation of a COM port, you must comply with the COM port requirements that are defined in Configuration of COM Ports.
Hello,
I believe the below article should help:
(If I understood rightly)
Virtual Serial Ports Windows 10
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Hi
The issue is not that the drivers are not installed, in most cases these are 'standard' on board serial and parallel ports with windows build-in drivers.
The issue is that since the 1511 update, if for example a printer is connected to the ports and you try to print, it immediately goes in an error state. (If you disable the port and then re-enable it, it works fine!)
Its definitely a bug in Win10 release 1511 with either the drivers or the way it access the drivers.
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Hello,
Sorry for the delay in response.
Let us run SFC scan and see if it brings any difference.
The sfc /scannow (System File Checker) command scans all protected system files, and replaces incorrect versions with correct Microsoft versions.
1. Press Windows + X keys.
2. Click on Command Prompt (Admin) to bring up an elevated command prompt.
Note: Click Yes if it prompts for permission.
3. In the command prompt type in the following command and then press Enter.
sfc /scannow
Note: Some files saved on your computer might get deleted when fixing corrupted files.
Kindly let us know if you have any further query on Windows, we are happy to assist you.
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Abdul
Due to work commitments, including temporarily by passing this problem, I have not had the time to reply to your answer. Which is in general terms a lot of nothing. Why would corrupt ddl/exe files suddenly stop the ports from working, without any error message, etc. Secondly why would a disable/enable cycle miraculously make a corrupt file suddenly UN-corrupt?
To prove you wrong. I clean install windows 10, then let it update to version 1511. (Please note, no additional drivers from motherboard install. All drivers as supplied with MS Windows.) Same problem!
So I am patiently waiting for a fix that solves the problem. Where possible I enabled 'Defer Updates', but that only defer the problem 'for several months'. With NO acknowledgement from Microsoft that there is a problem, that maybe to short.
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Kind regards
Cornie
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I'm having same problems with COM ports not visible in device manager.
After 3 complete new installs and running sfc /scannow, this is what I get
Microsoft Windows [Version 10.0.10586] (c) 2015 Microsoft Corporation. All rights reserved. C:WINDOWSsystem32> sfc /scannow Beginning system scan. This process will take some time. Beginning verification phase of system scan. Verification 100% complete. Windows Resource Protection did not find any integrity violations. C:WINDOWSsystem32>
Still no COM ports!
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