I'm not sure if this will apply to you or not, but I just reformatted my computer a couple weeks ago and am currently unable to re-register the game. Reason being is that the registration process won't take my key code anymore as it shows as being used, it was used by me, but seems to be only tied to your registry localized on your computer and not on their servers anywhere linked to your account. The only thing that seems to be stored is that the key was used.So I am currently waiting on Atari or the guys at The Witcher to get back to me on how to proceed or just with another key code.I would say if you are only replacing your video card and ram, then don't worry, but if you're replacing your HDD and using a fresh install for the OS, then you may run into the same problem that I am having.