[uripyores]

XP Pro or Home?
Looks like you were on the right track with "simple file sharing"
You probably need to take ownership; here's some guidelines: How to take ownership

 

[uripyores]

Safe mode;
1. Restart the computer.
Some computers have a progress bar that refers to the word BIOS. Others may not let you know what is happening.
2. As soon as the BIOS loads, begin tapping the F8 key on your keyboard. Do so until the Windows Advanced Options menu appears.
If you begin tapping the F8 key too soon, some computers display a "keyboard error" message. If this happens, restart the computer and try again.
3. Using the arrow keys on the keyboard, select Safe mode and then press Enter.
Then try the M$ thing again, maybe it'll work now.