@Richard-Kloostra Where did you buy it? It sounds as if it's licensed to another PC. If you bought it from Magix it should be licensed to you and you should have a Magix account.
i've put the question to support. just wait for their answer i guess. i've read in antother post that it might have something to do with missing .net framweork updates. it should work on win7 according to the specs.