How are you struggling with the cd? Can you not put it in the drive?
https://forums.macrumors.com/threads/219359/
Found it:
It's the key that says "option"
It's on the bottom row, two keys to the left of the space bar. Should say "alt" at the top and "option" at the bottom.
For your own sake, book a Genius Bar appointment and ask them to do it. I dont want to see you lose your info...
I can see this ending with Windows 2003 (?) getting installed over OS X and a new thread being made.