Well i had some problems initially  with the Witcher Enhanced Edition, as it seems that someone forgot to put a cd key in many of the new Platinum Edition copies, mine included. :( 
 
And, as i've played through the game once, i wasn't very happy of the low regeneration speed it takes HP and MP to regenerate, as it gets bothersome when you finish a fight and have to wait till health reaches minimal gauges to ply on through. Tried to apply this mod  
 
http://www.moddb.com/games/the-witcher/downloads/infinite-health-and-endurance  
 
which unfortunately didn't work. But after some searches that lead me nowhere looking for another mod, i came to make one myself.  
 
It works in the same grounds as the mentioned above, and works with the Platinum Edition.
 
Download http://www.megaupload.com/?d=UK2H06O0  
 
There are instructions within the archive. The mod shouldn't give any trouble, as i've only changed some values. But for any feedback, post here, or send me a pm. 
  
Cheers 
 
Happy playing!