Nexus 5 nothing bootable?
I know Windows doesn't recognize the phone but I still want to try something.
Download Wugfresh toolkit from here: (For download links just scroll down, there are some mirrors) 

http://www.wugfresh.com/nrt/

Once you install it, click "Full driver installation guide...". This will give you a thorough guide to uninstalling remaining drivers and installing the needed ones.

Hopefully, it will help you install the necessary drivers for the N5.
If it does work, Press the "flash stock + unroot" button on the right (I think you should check "soft-bricked/bootloop").

Hope it helps :)