code 45 error

Question

Microsoft:

I have two high definition audio devices in the device manager that states: Currently, this hardware device is not connected to the computer. (Code 45) To fix this problem, reconnect this hardware device to the computer. How to fix it? Should I uninstall the it, restart my device or...?

Answer 1

The weird thing is that usually when I uninstall a driver from the device manager and restarted my device, it should automatically install. But it didn't this time.

Answer 2

Hi Paul. I'm Greg, an installation specialist and 9 year Windows MVP here to help you.

Go to the PC or Sound device maker's Support Downloads web page to download and install the sound device driver which should resolve the problem.

If not I'll give you all possible solutions for Sound problems. If you have any problems performing any steps I'll be standing by here to help you.

1. First try this checklist: https://support.microsoft.com/en-in/help/402699...
2. Restore the Windows Audio Service which may have become disabled: https://www.tenforums.com/tutorials/57567-resto...
3. Update the sound driver from the PC maker's Support Downloads webpage for your exact model, if it is newer than the one presently installed in Device Manager reached by right clicking the Start button. While there compare to make sure you also have the latest BIOS, Chipset, Display, Network and all other drivers.
4. Right click Volume icon in System Tray, choose Sound Settings, from the Output and Input devices dropdown menus, choose then one(s) affected to see if that helps. If not use the Troubleshoot button nearby.
5. Run the Playing Sound troubleshooter at Start button > Settings>Update & Security>Troubleshoot.
6. Try rolling back the sound drivers in Device Manager reached by right clicking the Start button. Choose Sound controller and other audio devices, then Driver tab, then Roll back if available.
7. If no newer sound drivers then uninstall the one presently installed in Device Manager, reached by right clicking the Start Button. Restart PC to reinstall.
8. Try other and older drivers for your model Sound controller, too. For example, try the next oldest driver in the model's online Support Downloads list. To try all previous drivers installed on your system, in Device Manager choose Sound controller's Driver tab, then Update Driver, then Browse, then Let Me Pick.
9. If this was caused by Windows Updates then you can check which were installed at Settings>Update & Security>Windows Update under Installed Updates, then uninstall them from the link there, and hide with the Hide Updates tool downloaded from here: http://download.microsoft.com/download/f/2/2/f2...
10. If this was caused by Version 1809 update (which you can confirm at Settings > System > About) then you can roll back Version 1809 in Settings>Update & Security>Recovery and then hide it until it matures using the Hide Updates Tool downloaded from here: http://download.microsoft.com/download/f/2/2/f2...
11. You can also use System Restore to get before the problem began, then check for Updates with the Hide Update tool and hide them: http://home.bt.com/tech-gadgets/computing/how-t...
12. Go over this checklist to make sure the install is set up correctly, optimized for best performance, and any needed repairs get done: http://answers.microsoft.com/en-us/windows/wiki...

Start with Step 4 to turn off Startup freeloaders which can conflict and cause issues, then Step 7 to check for infection the most thorough way, then step 10 to check for damaged System Files. Then continue with the other steps to go over your install most thoroughly.

13. If nothing else helps then run a Repair Install by installing the Media Creation Tool and choosing from it to Upgrade Now. This solves many problems and will also bring it up to the latest version which you need anyway and by the most stable method. http://windows.microsoft.com/en-us/windows-10/m...

I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.

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Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.

Answer 3

Hello PaulPChou,

I'm Independent Advisor and Microsoft MVP, here to help you with your question.

Please refer this fix:

https://www.kapilarya.com/currently-this-hardwa...

Let us know if this helps!

Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.

Answer 4

* Merged

I have two high definition audio devices in the device manager that states: Currently, this hardware device is not connected to the computer. (Code 45) To fix this problem, reconnect this hardware device to the computer. How to fix it? A Microsoft agent suggested that I uninstalled it from the device manager, restart it and it should automatically install. Now, it is gone. Can't find it in the device manager. How to get it back?

Here is the link: https://aka.ms/AA4ly7x

Answer 5

Hi Paul

Click the link below to go to the support page for your laptop, from there download and install the Audio device driver recommended by Acer. Also there is a BIOS update that was released in October, that you may need to apply to your laptop, Installing those should resolve your Audio problems . . .

https://www.acer.com/ac/en/US/content/support-p...

________________________________________________________

Standard Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

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