If you are using the N version of Windows 8, you will not be able to use the MTP device. Only solutions to that for now seems to be reinstalling a non-N version of Windows 8, transfer files using Android Commander (over ADB), or push files with ADB if you know what your doing.
The other non-MTP devices for ADB and Fastboot can be installed by using Google's USB Driver in the Android SDK. (ASUS also has drivers on their site, but they're unsigned I believe and will require you to disable driver signature enforcement; these are the same drivers from Google also, so this maybe pointless)
I can confirm that MTP, ADB, and Fastboot all work fine under Windows 8 Enterprise x64, and ADB and Fastbook work fine under Windows 8 Enterprise N x64.