This is an AMD-chipset system -- oddly, Dell doesn't have the AMD drivers listed. You can get those from

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(install these drivers and reboot) -- that should solve the problem.

Thanks for the advice but I am still getting the "PCI encryption/decryption controller" exclamation mark. I installed (and rebooted) the chipset mentioned in the link of AMD's site: http://support.amd.com/en-us/download/chipset?os=Windows+10+-+64

The downloaded driver is:

http://www2.ati.com/drivers/radeon-crimson-15.12-sb-sata-ahci-win10-win8.1-win7-64bit.exe 

Please help.