My MacBook Pro will not install OS X Mountain Lion

I decided to wipe my macbook pro's hard drive. Once I did, I had to re-install OS X Mountain Lion. Well, it asked me for my Apple ID and Password. When I enter it, my computer says "This item is temporarily unavailable. Try again later." I've heard of other people having this issue and I have not seen a resolution to this issue. How do I install OS X Mountain Lion?

Sorry, if I sound silly on this next question, or string of questions, but:
What does EFI stand for?
Is it an acronym for something?
I thought that my MacPro is 64bit? Well that is as far as I remember the salesman telling me, back when I did the B.T.O spec.
I am running 64bit apps [in full 64bit mode] as far as I understand. Like the CS suiite.
If I look at "About Photoshop…" it says — Version 12.1 x64
Doesn't that mean that it is running 64bit apps?
Or are you saysing that the "entire operating system" / "bios" or whatever it is called in Mac language, is not actually capable of running as 64bit?
I need to find my box, that came with the MacPro, ans just have a look at the info that is detailed on it. As as far as I can remember there was even a big "64bit" flashy thing, somewhere on the outside of the box.
But in the meantime, if you can perhaps help with the earlier questions.
And perhaps one more …
Where woudl I find the info / persons that I could investigate that "Hack", as I may need to investigate that a little. If anything just to be better informed, for the future. At the end of the day, if I have to scrub the entire Mac to the beginging, and reload everything, so be it, at least it will be a learning curve in the process.
I have all the legal software installers etc, so all that it will cost me is time, if it does "kill" the operating system …

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