I did it by removing several lines starting with <SetFileinformation.... and with the tons of AAAAA...FFF..II...AAA..BBBB letters.
I imagine that it removes the blocking lines...
I will see if it is stable and if I can restart SP1 update :)
Yes I am crazy.
This is what I removed thanks to windiff :
http://pastebin.com/00MRcbnx