Gamartto: I'm trying to register the game but unfortunately my password is not correct and when I try to recover it the system never sends the message required to do so to my registered email address.
Pocari: I have exactly the same problem. Password not accepted and recovery doesn't do anything. I contacted CD Projekt and I guess I just have to wait for them to get back... :-/
Registration is not required anymore, since Patch 1.1.
Just install the version of 1.1 corresponding to your game's version (gog, retail...) and then install Patch 1.2.
P.S.: All the required links can be found here:
http://www.gog.com/en/forum/the_witcher_2/patch_1_2_released/post1