Windows 10 keeps corrupting

I recently had to delete Windows 10 Pro for the third time on my Macbook Pro due to corruption. I would like to know why it keeps doing this, and if I should download Windows 7 Ultimate. Windows 10 Pro usually works for 1 month before corrupting and losing all data. It usually happens when I boot in, and will not let me into safe mode. I have been using a bootable drive to download Windows 10 Pro and will be using the same one to download Windows 7 Ultimate.

Mac used:

MacBook Pro (Retina, 15-inch, Mid 2014)

2.8 GHz Intel Core i7

16 GB 1600 MHz DDR3

Intel Iris Pro 1536 MB

NVIDIA GeForce GT 750M 2048 MB

512 GB SSD

OS X El Capitan (10.11.3)

Flash Drive used:

Lexar 16 GB Flash Drive