What model is your pc?

did you make sure to select windows 7 on Dells driver support page and have you confirmed the cable works or tried on another pc?

This is a Dell Optiplex 9020 Desktop PC.  The PC performed correctly before thge reinstallation of Windows 7 Professional.  After the Windows reinstall, I can not connect to the internet.  I went to Device Manager and discovered that a number of motherboard device drivers are now missing. The missing drivers are:

Ethernet Controller

PCI Serial port

PCI Simple Communications Controller

SM Bus Controller

USB Controller

I went to the Dell site on another PC and downloaded drivers and attempted to load them on the Dell 9020.  Each time I tried to load the driver, I get this error message

" The procedure entry point AddDllDirectory could not be located in the dynamic link library KERNEL32dll"

Thanks for any asistance.

Bob W.

I downloaded the cab file, unzipped it in the Documents directory, and went to Device Manager.  I attempted to first load the Network Device driver.  I pointed to the file in the Documents directory and I receive an error message

"Windows was unable to install your Ethernet Controller.  Windows could not find the driver software for your device."

Have I missed something?

Out of curiosity have you tried the Intel Device Manager Diagnostics Utility (DMIX)?

here's a link to the download https://dl.dell.com/FOLDER04568507M/3/Intel-Device-Manager-Diagnostics-Utility_DX8CM_WIN_22.3.108.0_A04.EXE

this download link is for the OptiPlex 9020 Windows 7 64Bit 

I did download and try to execute the utility and I still get the same error message that I gwet with every dell file that I have triewd

"The procedure entry point AddDllDirectory could not be located in the dynamic link library KERNEL32.dll"

Many thanks for all your input

Have you checked you have the service packs installed? You can do this by following these steps

1. Select the Start button > All programs > Windows Update.

2. In the left pane, select Check for updates.

3. If any important updates are found, select the link to view available updates. In the list of updates, select Service Pack for Microsoft Windows (KB976932) and then select OK.

   Note: If SP1 isn’t listed, you might need to install some other updates before installing SP1. Install any important updates and then follow these steps again to check for SP1.

4. Select Install updates. 

    

    

    You might be asked for an admin password or to confirm your choice.

5. Follow the instructions to install SP1.

6. After SP1 is installed, sign in to your PC. You might see a notification indicating whether the update was successful. If you disabled your antivirus software before the installation, make sure you turn it back on.

please try to update your drivers after following the above steps.

I would say I more likely fix in the long term would be to update to windows 10 as support for windows 7 ended on January 14, 2020.

you will probably have more luck however if you are set on windows 7 trying the above could help.

Another thing you could try is the Dell Command | Update utility. I have an OptiPlex 7040, and he's always able to get updates that way, then again, running Windows 10, build 2004. Not sure how much of a difference that would make, though this does sound a bit familiar to me, too.