Help on First built computer system (lots of it too)

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Lol, well I actually do need a job sometime soon...
Wait, nevermind. I'll see how tonight goes. Hopefully I'll be able to persuade them enough but I won't fully count on that. I'll reply about how it goes.
 
Hey everybody I'm back with some great news I ordered most of the parts except for one thing. (Which was stupid on my behalf) The operating system! Anyway, I just want to know, If I were to get the full version of Windows Vista what would be the benifits opposed to the OEM version? And if I install an OEM is it true that I won't be able to get any support?