I created a new folder called PCI Serial Driver fix. * Unzip this compressed Dell file into a folder of your choice. The package is older, but it contains the correct driver for the PCI Serial port which is missing on your machine after upgrading to Win 8 or 10 * Don't choose the autoinstall exe package. * Download the following Dell driver package, and ignore the warnings that it's older than what you have currently installed: Intel_Unified-AMT-7-Manageme_A01_R298379 The fix he found for Win 8.1 back in 2014 works perfect for 790 and 990 under Win10. I'd like to give John Makster about 99% of the credit, but his answer was buried in a forum thread that was tough to find. Intel driver detection tools also won't fix this issue.
This trouble occurs when you upgrade from Win 7 which is fully-supported by Dell on these machines, to the unsupported Win 8 or Win 10.Īgain, this trouble surfaced because Dell decided not to provide support Win 8 or Win 10 for these PC's. After 3 days of digging, I found the fix for the OptiPlex 790 and 990 PCI Serial Port Driver issue which shows as a yellow triangle under Device Manager.
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