FIX MBR

To fix a W7 or W8 boot problem use the OS DVD or a Repair Disk.

Use Windows 7 DVD and choose install now

or

Repair CD

Select "Use recovery tools" and choose the boot drive

Choose the "command prompt"

We will be using bootsect.exe

to get there

At the command prompt -->

Type: diskpart

and press Enter

the picture below was done from a command prompt on a working system (w7)

Type: select disk 0 (zero)

and press Enter

If your boot disk is not disk zero change accordingly.

type: list volume

and press Enter

this is to find out what our DVD drive letter is ...let's says our DVD is Drive D:

type: exit (press enter) , this is to exit diskpart

type D: this will place the command prompt at the DVD.

at this point you can type DIR (enter) and should see bootsect.exe

type this to fix the MBR

bootsect /nt60 SYS /mbr

now type EXIT (press enter)

follow the screen prompt to restart.