Clotilde1984 did you try opening one of the other Adobe Creative applications prior to opening Acrobat X? For Suite installations which include Acrobat as part of the install process Acrobat has to be licensed by running another software title from the suite such as Photoshop. Once Photoshop CS5.1 is launched it should then license Acrobat and you will have no need to enter a serial number when opening Acrobat.
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