Touchscreen 7.9" + PC only with usb power + arduino

Hi guys, i am kind of new to arduino and am planning to make a progject with a 7.9" inch touchscreen which should act like an interface for both displaying data from the pc and taking inputs from the user. the arduino board is like a connector of the two (at least thats what i planned). Please let me know if this is possible and as to which board should i use and if i can runt the whole setup only on usb power

I am going to use the nexus 7 touchscreen

Thank You
Akshay Thakare :wink: