: Although Dell does not provide official Windows 10 drivers for the aging 780, Windows Update can often resolve the issue automatically. If it fails, the Windows 7 or 8.1 version of the Management Engine driver can frequently be installed in Compatibility Mode to satisfy the hardware requirement.

The OptiPlex 780 uses a proprietary AMT (Active Management Technology) PCI Simple Communications Controller. You do not need an actual "PCI serial port card" driver.