I upgraded a Fujitsu Esprimo P420 E85 + for Windows 10. In the Fujitsu support site indicate that the equipment is certified for Windows 10 x64. After you install Windows 10, in Device Manager appears two "Multifunction Device 'in' Other devices', corresponding to hardware 'MF \ PCI # VEN_9710 & DEV_9922 & REV_00 & SUBSYS_1000A00'.
The Fujitsu Deskupdate software not installed, and Windows 10 attempts to download and update 'MosChip Semiconductor Technology Ltd - Bus Controllers and Ports - PCIe to High Speed Serial Port', but the update gives an error and after Reboot the PC occurs an automatic process Recovery.
I think the hardware is 'MosChip MCS9950 multifunction controller chip', but there is no driver for Windows 10.
I would appreciate help to solve this problem.