http://ati.amd.com/support/driver.html

This is what I did, but it still won't capture on my xbox 360. You need to go on Start> Run then type in dxdiag to see what Graphics Card you have atm then update it by downloading the new driver.

Also would you be able to tell me how you have it set up because I have mine set up correct but i get the error message " A Valid Input Signal has not been detected. Please check your cables", I don't know how to fix this either.