Hi

You have two options:
1. you can run a windows repair from your Operating System disk, booting from the disk. This wont remove your data nor would you need System drivers.

OR

You can slave your drive back in your bro's pc and change the security settings to get full rights, I think you have to be logged in as the admin to do so. But note your bro's PC must be XP professional.


Let me know if you need some detailed advice and I'll direct as to how to fix this easy fix.

[edit]
option two can be modified to allow you full access to that drive.

Does it display an error message on the black screen? (If so please post it).