No you can't
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You can not obtain mods for games on a console, so there is no such thing as an "xbox mod".
Magicka Sabers is a mod but I hear some person not naming who has developed a way to mod Skyrim on xbox 360 and is running tests on it so wait and you will be able to cya cuzz
It looks bad because its not PS3
There is no way to use your existing Xbox 360 controller on your PC. However, Microsoft have released a PC controller which is a Xbox controller.
No there is no multiplayer or cooperative modes on The Elder Scrolls V: Skyrim. It is only a solo game like most RPGs.