https://www.intel.com/content/www/us/en/support/articles/000025619/software.html

bios A24 and install of latest AMT HECI SOL drivers is required.

https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=c10t9&oscode=biosa&productcode=optiplex-990

https://dl.dell.com/FOLDER05078495M/1/O990-A24.exe

You install ALL of the drivers by downloading cab file

https://downloads.dell.com/FOLDER02161719M/1/990-win7-A10-5GWVN.CAB

then move that file to the MY DOCUMENTS folder.

Then install 7ZIP

https://www.7-zip.org/download.html

Then right click the cab file in my documents and with 7zip say EXTRACT HERE.

While offline you say update my drivers from MY computer instead of from the internet.

This is the procedure for WIN 7 OR 8 OR 10

As stated prior, I flashed BIOS 3 times which is the latest A24. It was installed fro a long time before this error started as well. I have all the latest drivers from what I know so no clue what else to do.

Bios did not get updated or its corrupted.  F2 should show the version.

You will need to reinstall windows clean and use the cab files to install the drivers.

This 10 year old model is end of life end of support.

INTEL AMT drivers are matched to the AMT VERSION of the bios.

If clean bios install does not work you may have other issues like corrupted files.

Windows 10 is not supported on this model but it does work.

BIOS is fine. Any direct links to proper INTEL AMT driver? I have had this error both on windows 7 64 and windows 10 64. I reinstalled 2 times but no luck. Flashed BIOS 3 times with A24. no clue what else to do.

You install ALL of the drivers by downloading cab file

https://downloads.dell.com/FOLDER02161719M/1/990-win7-A10-5GWVN.CAB

You must move this to MY documents folder.

Then extract the contents via 7zip. This is an installed program.

You Install 7zip so you can extract ALL DRIVERS from the cab file.

There is support for SCCM its not free.  There are no WIN10 drivers and never will be.  That means the drivers built into 10 do not apply to a 10 year old model and never will.

https://www.7-zip.org/download.html

You Right click the cab file in the my documents folder and with 7zip you say extract here.

You then disconnect and go offline and say update my drivers from My computer instead of the internet.

This is a very specific procedure.  Its the same for WIN7 or 8 or 10.

ALL DRIVERS 32 and 64 bit are in the ONE CAB FILE.

There is no further assistance.

I assumed bios would resolve it but I can't get it to fix it. I have no idea what SCCM is. I have already done everything on the list of to dos but it's still there.

If you have latest bios and clean non corrupted install and you install the drivers via the extracted cab file in my documents it works.

Do not download a tool that claims to fix this its malware or ransomware.

No such TOOL exists from INTEL or Dell or Microsoft.

I dId it yesterday clean install offline and it works fine. There is support for

System Center Configuration Manager SCCM its not free.

You cannot point to a cab file.  The contents MUST BE extracted to the MY DOCUMENTS folder.  You install and use 7zip for that by right clicking the cab file moved to MY DOCUMENTS and say EXTRACT HERE.

Once thats done you go into device manager and update drivers including storage and INTEL AMT and any other yellow ! by right clicking while offline and saying update my pc drivers from this computer not from the internet.  It will automatically look in the my documents folder and find the drivers.

https://www.7-zip.org/download.html

https://www.dell.com/support/article/en-us/sln312414/dell-command-deploy-driver-packs-for-enterprise-client-os-deployment?lang=en

Dell Command | Deploy Driver Pack contains the drivers in the form of .CAB files for Dell commercial client systems. The Driver Packs help with the Windows operating system deployment process by using Microsoft End Point Manager Configuration Manager (MEMCM) or Microsoft System Center Configuration Manager (SCCM), and Microsoft Deployment Toolkit (MDT).

System Specific Driver pack CAB file

https://www.dell.com/support/article/en-us/how13802/optiplex-990-windows-7-driver-cab?lang=en

WinPE Driver packs are designed to provide required drivers for WinPE to boot a Dell Latitude, OptiPlex, or Dell Precision workstation for operating system deployment.

Dell Family Driver Packs are designed to deploy on multiple models, and are supported by the Dell configuration services.

Resources

Clear Bios, Disable AMT in bios.

Uninstall AMT drivers.

The error will stop.

There are two places to disable AMT feature

1. In BIOS Intel AMT (Enabled,Disabled)
2.CTRL+P to go AMT Menu(Inte ME Control state(Enabled,Disabled)

@speedstep, I see nothing that says AMT. I have no clue what you are saying. It just doesn't exist in my BIOS as you describe it and I get nothing when I select CONTROL + P. I am pulling my hair out here.

I did everything properly and the error is still there. I am at a loss at this point. I thank you for your time and effort though. I appreciate you @speedstep 

@speedstep, I used this SOLUTION to resolve it. I wanna thank you for helping me.