Bsod

Hi, can someone help me please?
I have a Lenovo Flex 2-14 running W 8.1
It is showing the BSOD saying
"your PC ran into a problem and needs to restart.
We're just collecting some error info, then we will restart it for you"

If you'd like to know more, you can search online later for this error:
UNEXPECTED_KERNEL_MODE__TRAP (ntfs.sys)

It gets up to 100% then tries to boot. 'Lenovo' comes onto the screen with the busy sign of a whirling circle then it goes black again and back to the BSOD.

I have tried to boot into Safe Mode by hitting F8 but it doesn't work.

Can anyone help please?

Thanks, Jan