I've not done this in a very long time, but the WinPE install isn't too difficult.
Also, you can copy the files in from another system on which it's working and just point to them, I'm pretty sure.
Anyway, there's a couple of thoughts. I think there are some KB articles on this as well. Problem is, I've not looked at this version in almost 2 yrs now. :S I'm getting rusty!