I don't think such a thing could be possible with current computers, let alone US. The best thing you could do is, like Darvince said, cause a massive explosion and hope your computer doesn't die!
I personally have my own theories about the Big Bang, to be slightly off-topic.
Consider:
1.) All galaxies have a supermassive black hole at its center.
2.) Galaxies are "mobile" -- Their centers move towards other galaxies.
3.) The nature of black holes is to consume -- mass approaching a black hole is added onto a black hole.
From this, one can logically assume that all mass in the universe, after an unfathomable amount of time, will eventually fall into one, single black hole.
I personally think that something happens to that black hole -- something to destabilize it (Here lies the biggest hole in the theory -- what could destabilize a singularity, let alone a black hole?), and release the mass. The sheer amount of energy such a process would release can only be described as that -- a sphere of pure energy being emitted back out into space.
Also consider that energy and matter are interchangeable -- An object traveling at (or beyond) the speed of light would "become" energy.
That is, in my opinion, what a "White Hole" would be. A being of pure energy being emitted out into space, condensing back into matter.
Such a thing would only exist once in a universe's lifetime -- at genesis, and can be comparable to a Big Bang.
Of course, this is still only theoretical at best, and is no better than the Big Bang "theory."