First, reformat the drive, and don't use any free programs to copy windows installations, etc. Don't use any free downloads to interfere w / windows.
Don't you have a DVD drive on your computer? Just put the disk in the drive.
Set the bios to boot the DVD drive first. You probably need to do this.
Put the disk in and start the computer.
If you have to, connect a DVD drive temporarily. Then load your OS, and disconnect it after...