So long story short - i've bought a laptop with pre installed windows 8 and now want to boot my old PC's hdd with windows 7, but it has completely different drivers and therefore does not boot (gets blue screen at windows loading, same blue screen even at safe mode). So what i want to do is to delete all drivers like it would be a clean windows 7 installation, without having to delete my files on the hdd. My goal is to both boot windows 7 and keep the files.