hi guys i was installing kali linux 2.0 in my laptop with windows 8.1 but at install files step it say "installation step failed "f6Bjq.jpg
i have down every thing right but getting same error

i am installing from usb and i have given 40gb IMG_20151203_243737425.jpg

Troubleshooting installation errors

downloaded the correct image
downloaded from Official website
verified SHA1 checksum of the downloaded image.
There’s no disk fault or bad sector in your hard-disk.
but still getting same error

if u guys want any more info from my please tell me and please tell me how to resolve this error