I just found this. It make smy PC boot in less than half the time as before.
-> Create a new Textfile
-> Open it with notepad and type the following:
SHUTDOWN /S /T 0
-> Rename the file to bootdefrag.bat (you may do this by saving the file, but choose "All files")
-> Move it to your autostart folder (its located in the start menu)
-> Reboot