This issue is caused when Microsoft Windows does not properly detect the chipset or videodisplay.
Install Dell Precision M3800 laptop drivers for Windows 10 x64, or download DriverPack Solution software for automatic drivers intallation and update.
They are 'on PCI Express Root Complex' and 'on Microsoft ACPI-Compliant System'. Windows 7 Ultimate Windows 10 Enterprise LTSC 2019 Windows 10 Enterprise 1709 Ubuntu Linux Quad-Boot Beast. So i went to dell/support/drivers enter my tag and download it from there 'Alienware On Screen Display Application', like i did for 'Alienware. Aug 31, 2017 Windows 10 PCI Express Root complex Code 28 I installed W10 on my 2009 Dell Studio only to find today that Dell don't support W10 on this machine! Therefore the driver needed to sort out the PCI Express Root complex Code 28, is only for W7 or W8.1. Install Dell Latitude E5420 laptop drivers for Windows 10 x64, or download DriverPack Solution software for automatic drivers intallation and update.
Corrupt or missing motherboard or chipset drivers
Download and install the latest chipset and video card drivers. If you or someone you know built your computer, it came with the motherboard CD. This CD contains the chipset drivers. Otherwise, you can find drivers for all the major chipsets on our motherboard drivers page.
Corrupt or missing video card drivers
If installing the latest chipset or motherboard drivers doesn't resolve your issue, make sure you have the latest drivers installed for your video card. For a listing of video card drivers, see our video card drivers page.
Other PCI device that Windows cannot identify
If you tried the above two steps and your Windows Device Manager still contains an Unknown PCI device, likely the device cannot be identified.
If you that the device not being identified is installed, we suggest you obtain the latest drivers for that device. A listing of drivers is on our drivers page.
If you have recently finished installing or reinstalling Windows onto the computer and are getting the unknown PCI device, we suggest you manually identify the PCI device through the registry.
Pci Express Root Complex Windows 10Additional information
Corrupt or missing motherboard or chipset drivers
Download and install the latest chipset and video card drivers. If you or someone you know built your computer, it came with the motherboard CD. This CD contains the chipset drivers. Otherwise, you can find drivers for all the major chipsets on our motherboard drivers page.
Corrupt or missing video card drivers
If installing the latest chipset or motherboard drivers doesn't resolve your issue, make sure you have the latest drivers installed for your video card. For a listing of video card drivers, see our video card drivers page.
Dell Pci Express Root Complex Driver DownloadOther PCI device that Windows cannot identify
If you tried the above two steps and your Windows Device Manager still contains an Unknown PCI device, likely the device cannot be identified.
If you that the device not being identified is installed, we suggest you obtain the latest drivers for that device. A listing of drivers is on our drivers page.
If you have recently finished installing or reinstalling Windows onto the computer and are getting the unknown PCI device, we suggest you manually identify the PCI device through the registry.
On Pci Express Root ComplexAdditional informationPci Express Root Port Windows 10
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