Go here and for starters download and install the chipset drivers.
I have just had to do a clean reinstall of Windows 10 after a bad disk corruption.  Most things are working grate now but I have some missing drivers showing in Device Manager which I cant locate either with Windows Update or through the Dell Support Drivers and Downloads page using Dell Support Assist They are Other Devices - PCI Data Acquisition and Signal Processing Controller - PCI Device - PCI Device - PCI Memory Controller - SM Bus Controller Can anyone identify what drivers I am missing her so I can search for them on the Dell Drivers and Downloads page?  
XPS 9365 Missing Drivers