I think it's the recovery console option.
Anyway, when you get to the prompt , type:fixbootfixmbrchkdsk /f
However, they sometimes can be "helpful". Like when it tells you "unmountable boot volume" you can bet you have a bad hdd. If you have another machine to search with, you can sometimes get helpful information searching on the text error or the first alphanumeric string (0x000000xx), the strings that follow are parameters of the error.
Good luck to you, hope the hdd isn't the problem and you can salvage your data.
What the heck did I do to deserve this? Now it's my dvd writer that just gave way! It reads fine and is seen by the system with no problem. But I've tried writing with 5 different burning software (nLite, CD Burner XP, Nero, ImgBurn & Windows itself) and it hangs every time when I load the blank CD.I changed the burner with an old one I had laying around (which doesn't do DVD, only CD) and it works like a charm.