All you have to do is copy the file your missing into the sysprep/i386 folder not the whole i386 folder. I havent done it for awhile mainly because I don't like sysprep and started using newsid, but I used to have 8 or 9 files missing, even files like desktop cleanup wizard which I removed gave me an error. Just copying that into the i386 folder should fix it. Also why do you need to use sysprep. In active directory the sid gets pulled down from the server. See if this works for you.