license Cubase 6.5 (Problem with Installation)

Hallo everybody!

My licence Cubase not wants activation code once again. I used the program before and then I reinstalled Windows. Now the program refuses for me. What do I do now? Who can I ask for a new activation code?
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If the license is on a USB-key, simply install the e-Licenser software on the new Windows PC and all should be fine. Activation only takes place once.