I can only tell you what I know. You have accidentally started the restore porcess. I know what that is, but I do not know the outcome if you try to stop it after it has started.
If you want to save your stuff, use Ubuntu, I gave you that information.
Then save your stuff.
You can then use the restore process to return to the way it was the day you bought the computer.
If you want to boot from the CD try this: Boot Priority - Change
This may also help Bootmgr is missing
The advice that I give comes from my personal experience and questions others have asked. Your problem has never come up before, so we have to just try our best