Instead of how it cant find an os, it knows there is one, but the boot manager is messed up. I originally had a dual-boot configuration with Windows 10 Insider Preview, but I had an error with that so I removed that and cleaned up the mbr. Well something happened and the message I get when I get when I boot is this:

Windows Failed to start. A recent hardware or software change might be the cause. To fix this problem:

1. Insert your Windows Installation disc and restart your computer

etc.

the error code is:

File: \BCD

Status: 0xc0000098

Info: The Boot Configuration Data file doesn't contain valid information for an operating system.

I tried to boot from the recovery USB key I received. It would not boot. I tried my dvd and it would not work either. It also doesn't let me access the UEFI firmware, only the BIOS.

I would really appreciate any help that can get my laptop working.

Btw, my laptop is a Dell Inspiron 7737 (17 7000)