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I finnaly managed to install Microsoft Office 2007 from an official genuine installation DVD - not really. The problem: The setup program always complained that the language of the installation package was not supported on my computer (Sprache des Installationspaketes nicht unterstützt). The installation was supposed to be in German. I tried to change my system language to from German (Switzerland) to German (Germany). Didn't help. No way to install an original product?
I finally found the solution. Copy the files and folders from the DVD to the harddisk. Rename all folder with names such as Excel.de-de to have a postfix of de-DE (instead of de-de). This makes it Excel.de-DE (and the same for Word, PowerPoint, ...). Install from the harddisk. Works fine.