i currently run tiger on a mbp duo core 2 that i bought off of ebay and the seller didn't give me the password or bother to include any of the software. i can't add new software/programs and do everything else needed due to this jerk being like this. i really need to be able to get past this as i plan on using it for cs3 and final cut 2, so............should i just find a copy of tiger due to problems with leopard and this software, or should i just go with leopard? help would be great since i've been using panther on my g4 due to hardware/software conflictions that come with updated os and i don't really know anything more current than this os.