knowing the situation better...
it sounds as if the first thing to try would be windows install via flash drive. you may need to buy a bigger drive though however this should not cost much at all.
you may even just be able to do a windows repair instead.
what file? did you try replacing it?
it wont even boot now, it does the boot screenm goes to windows reapir, says it cant fix it then reboots, ive tried to fix it and i just scred it up more, the only thing i have is an sd caard, dont see why it would be any differnt then usb