GRIGORICH, Below are some knowledge Base articles that will provide information on getting your OS Back onto your computer.Reset or reinstall Windows 10 on your Dell computer Dell Windows Recovery ImageCreate Windows installation media for your Dell device. Inspiron 3655 Drivers, Downloads and Manuals Drivers Install Order- must be followed for the hardware to work properly
I  would like to hear from users that have succeeded in rebuiding their OS from a USB flash disk. I am on an Ispiron  3655 computer and windows 10. The OS came pre-installed. Should it crash I would like to restore it in the shortest time possible. I do have a recovery usb flash disk. Thanks for your help Grigorich  from 
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