I got my Private Key now from the address by using: dumpprivkey [your public key here]
So, tried to do that again: https://en.bitcoin.it/wiki/How_to_import_private_keys_in_Bitcoin_Core_0.7%2B
Worked, exept that i dont see my Bitcoins, I just see the address in my wallet.
What else can i do to get on my bitcoins?