Windows Defender now has all functions of FEP/MSE built into it. So unless you are using an enterprise solution to manage AV there is no reason to install it. Also FEP installed fine without any sort of hacks... I installed it fine without any hacks on my system.
ok show me an defender in win 8 with "network inspection system" i know you cant here an picture of MSE 4.1 ive running in win 8 RP