Important: Device Manager error codes are exclusive to Device Manager. If you see the Code 28 error elsewhere in Windows, chances are it's a system error code which you should not troubleshoot as a Device Manager issue.
Cause of the Code 28 Error
A Code 28 error is caused by a missing driver for that particular piece of hardware.
There are any number of reasons that a driver might not be installed
for a device but your troubleshooting of the problem will be the same no
matter the root cause.
Error Code 28 Troubleshooting
Please let me know if you've fixed a Code 28 error using a method that I don't have above. I'd like to keep this page as updated as possible.
There is always the slim chance that the Code 28 error you're seeing
in Device Manager was caused by a fluke with Device Manager or in your BIOS. If that's the case, a reboot might fix the Code 28.
Undo the change, restart your PC, and then check again for the Code 28 error.
Depending on the changes you made, some solutions might include:
Important: Make sure you install the drivers for the correct
operating system. For example, if you're using Windows 7 32-bit, install
the drivers designed for that specific version of Windows. Many Code 28
errors are caused by attempting to install the wrong drivers for a
device.
Note: I do know that certain service packs for Windows Vista
and Windows 2000 have contained specific fixes for some instances of the
Code 28 error in Device Manager.
It's also possible that the device is not compatible with this version of Windows. You can check the Windows HCL to be sure.
Note: If you still think there is still a software/operating system component to this Code 28 error, you could try a repair install of Windows. If that doesn't work, try a clean install of Windows. I don't recommend doing either of those more drastic options before you try replacing the hardware, but you may have to if you're out of other options.
The Code 28 error is one of several Device Manager error codes. The Code 28 error will almost always display exactly like this:
"The drivers for this device are not installed. (Code 28)"
Details on Device Manager error codes like Code 28 are available in the Device Status area in the device's properties: How to View a Device's Status in Device Manager.
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