No, I don't think that will help you.
For windows OS to boot up it need a primary file called MBR( master boot register) this set of files contain the information about loading the windows operating system. Its like the icon of a software, when you click it it executes all the paths and locate files and load your software. The MBR is a auto executable file which work as a icon to windows. When you separate the drive everything will be lost and for Linux grub is the loader. So, even if you bring back all just it was, it doesn't mean you have the MBR in correct position.
I do have a solution that can help you. If you have windows files backed in your primary drive. Download the ISO of RECATUX, burn it and boot it up. This small Linux OS will open up with a window. In that click restore MBR. That's it problem solved.