I have no solutions to your immediate problem Franck but for the future I'd suggest you using
Norton Ghost This program creates an image file of your entire harddrive which you can copy on a backup drive or DVD roms. When you want to boot up your backup you just insert your norton ghost CD and it boots your harddrive back up again within less than 20 mins.
I backup mine now every week so if i ever end up with some spyware or virus I just bootup my most recent norton ghost backup and everything is back to normal within 20 mins