Cities XL 2011 asking for a Serial Code (Dont have one)

[Zyklon Beekeeper]

After having my computer reset, I went to play Cities XL 2011 again and then it asked me for a Serial Code, like those ones you get when you open PC game cases. Image: http://gyazo.com/e91bc64102d27390b383b217c3fcc886
I've no idea what to do. And if there's no way to fix this (I'm sure there is right?), I was hoping to get a refund sent to my Steam wallet.

thx m8 no h8 i r8 8/8 gr8 b8 i can rel8,
spooky