I installed windows 7 on thinkpad E440 and it worked correctly then I installed ubuntu 16.04 and it worked correctly too. I switched between them a couple of times and everything was ok. after a couple of hours ubuntu worked correctly but when I wanted to boot into windows, when I choose windows loader in the grub I face with ubuntu purple screen and it stucks there nothing happens like the below image . I tested win 10 and 7 alongside ubuntu both results was the same like told. I had win 8.1 on my laptop before starting to install ubunto but I formatted the whole disk and replaced it with zeroes. does anyone know how to fix this ?