MP4 no access to it, life-saving ah

I get MP4, to pull out the Safely Remove Hardware when there are two, I deleted one, MP4 on it.But I have a computer that 6 or 8 can be mobile devices, HI, J ……but I get less This half, M, L not two out, MP4 also had no access to, ah help! ~~~~~~~~~~~~
chaos to a point where devmgr said that there was no document is not for this reason ah! ~ ~ ~ 555555

MP4 have their own system, you pop the capacity to be able to restart a look The computer will have a