Cant register game!! >.<

So i bought galciv 2 after loving the first game. TRied too register first time and got the whole 'emailed link' thing. There was no link on my email i received and now when i try too play my updated version of galciv2 it says i need too register.... when i try too register it says invaild even though it was accepted the first time!!!

So now i cant play at all, i have a serial code (on the back of the instruction manuel - aussie retail version) that wont be accepted and have just spent the last 3 hours screaming at my monitor >.<
..!.

Pls help