I have nero 9,worked well until now.I get a message that I need a licence from someone else, but I am thr one who bought it.what to do?

I bought Nero 9, and Back it up 9, got two serial numbers, but I go the message my version is working on another computer as well,which is not the case.
maybe the problem is, that I got a cd ,nero multimedia suite 10 essentials that came with a product I bought, and instyalled it.
Please help
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