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So basically what you plan to do is insert into a program the position and state of every atom in the universe? I hope you have a lot of ram!
Well the problem with large scale predictions is understood through non-linear dynamics (chaos theory). Quite simple in order to get accurate predictions over any reasonable length of time you need your initial conditions to be 100% accurate.
Naieve intuition might suggest that if you have initial conditions 99.99% accurate then your predictions would come out very accurate (say 95% accurate). This simply isn't the case. What acutally happens is the prediction and the actual diverge after quite a short period of time.
Two very interesting and totally accessible popularizataions are Chaos by James Glieck and Does God Play Dice by Ian Stewart.
And getting 100% accurate initial conditions is not just unimaginable infeasable, but it is actually impossible, even in principle, as the Heisenberg Uncertainty principle forbids it.
Another problem is that physics is not deterministic (or at least not at the level to which we have access). So there is unpredictable randomness which makes the outlook even bleaker.
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