Roflmao a laptop?! You need a manly desktop to do all that, typically a server or dedicated box does intensive calculations like that. Buy a 2600k with 16 gigs of ram at LEAST, if not consider getting a higher end server box, dual xeons or the like. (4x4gb - assuming the database could and would use all the ram), And an SSD would be even better for the database then RAIDing some drives together, though you would need a mechanical drive for sure with movie rendering for the sheer amount of space required for temporary uncompressed materials. It wouldn't be Windows that couldn't handle the power, it would be the applications themselves, poorly coded or threaded.
Computers can do a lot more then one thing at a time, but not if that one thing requires a lot of resources. Again, use task manager to manage the priorities and cpu affinities of the intensive applications to make the computer a little smoother (at the expense of slower crunches)
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