windows 7 Edit windows 7 settings externally

[Bottibo]

Hi

I have some issues with my school laptop, they're kind of self made because i tried to install windows xp beside windows 7. It ended with the iso being half working and corrupted the bootmanager.

Is there a way for me to edit the bootmanagers settings from booting in to corrupted xp install to normal windows 7?

The bios has blocked booting from anmything else than a 120gb ssd and ethernet, so usb drives is kinda not an option. But if i have to i can put it into my desktop and use that motherboard instead, if necessary.

 

[Bottibo]

and i cant get my hands on a windows 7 iso because i dont have the product key