Many thanks!
In fact, before reading your answer, i found
http://www.winsupersite.com/showcase/windo..._slipstream.aspAnd i follow step 2: how to extract! As soon as i have understood that /extract switch was a command line from cmd, it has been easier!
So i renamed my sp1 and sp2 files easier and extract them to my office 2007 updates folder
And i burned the full Office 2007 folder on a DVD with Nero
And it works, i have just installed it on a laptop!
NB: My only regret is about the size! I hoped slipstreaming Office 2007 with Services Packs will give me a folder less than 700Mo, or i have now a folder of 1,18Go!!!