The below video shows how simply and quickly you can create a WinFE ISO. As you'll see in the video, all you need to do is...
1) Install Windows AIK
2) Download the WinFE batch files
3) Run "createfolders.bat"
4) Copy your forensic tools into a folder
5) Run "createwinfe.bat"
6) Burn your CD with the created ISO
[youtube=http://www.youtube.com/watch?v=VUwDjYC5TUE]