Got an Inspiron 5565 for Christmas. Works fine until I get notification for 3 Dell updates. they fail to install and now Win 10 can't boot but Dell Support Assist says everything is OK so reboots laptop only to be told Win 10 can't boot, & repeat. Decided to set up a Dell OS recovery usb and the software rendered my usb stick useless !
I'd suggest you create Windows 10 installation media from a good working computer in the link below.You'll need a blank USB flash drive with at least 8GB of space.