ricktendo has absolutly NOTHING todo with Longhorn Tansformation pack. I did GOOGLE search for you and the simple easy todo search came up with http://www.softpedia.com/get/System/OS-Enh...nsforming.shtml Plus LOTS of other links to it.
I have had that error with WMP11 slipstreamer also. It's fairly random. I always do sp3 or Ryans pack #1 then IE7 #2 with all of my other addons in there like the soon attached picture. I add WMP11 seperately last as a final proccess.