Boot failed, pantalla roja .GRUB4DOS ERROR.Boot failed, red screen .GRUB4DOS ERROR

Desde cd o usb booteable.ponemos de forma como si fueramos a instalar windows,pero al llegar a la parte que pone instal now.Eso no lo tocamos,nos vamos abajo a la izquierda,en el del medio, donde pone Repar your computer.
Nos sale.
system recovery options.
marcamos sistema y Nex (siguiente)
comamd promot,opena command
pantalla negra
Administrator:x\windows system 32 cmd exe
X:\sources)escribimos boottrec /fixmbr y pusamos enter
Nos aparece operacion completa y algo mas
nos sale de nuevo .X:\sources)boottrec /fixmbr.Escribimos lo mismo que antes,pulsamos enter
nos sale de nuevo .X:\sources)boottrec /fixmbr
Cerramos cmd pantalla negra.
Pulsamos en restar(reiniciar)
Nos aparece iniciar windows normalmente,ahi le damos,si es que no inicia sin mas.
Nota,antes de /hay que dejar un espacio.como se puede ve en lo que yo escribi.
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INGLES.
From cd or usb booteable, we put it in a way as if we were going to install windows, but when we get to the part that says install now, we do not touch that, we go to the bottom left, in the middle, where it says Repar your computer.
It comes out.
system recovery options.
we mark system and Nex (next)
comamd promot, opena command
black screen
Administrator: x \ windows system 32 cmd exe
X: \ sources) we write boottrec / fixmbr and put enter
Complete operation appears and something else
We get again .X: \ sources) boottrec /fixmbr. We write the same as before, we press enter
we get again .X: \ sources) boottrec / fixmbr
We close cmd black screen.
Click on subtract (restart)
It appears to us to start windows normally, there we give it, if it does not start without more.
Note, before / you have to leave a space, as you can see in what I wrote.
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