That's just an Xbox 360 still, not a PC made from an Xbox 360.
I doubt that this will work if you want any recent OS, the Xbox has (if I recall correctly) integrated graphics, 32Mb of RAM and an 800(?)MHz Pentium 3 CPU.
The CPU is still fine to run XP and the like, but you would need a lot more RAM.
Good luck anyway, you may find a way to make this work.
I for one doubt it, but I would be the first to say well done if you did manage it somehow.