ok so i dont know if you need one for cs3 or cs4, so for now heres one for cs4:
once you actually get it up and running, its kinda freaky looking and hilarious at the same time, but im pretty sure its safe. as in i used it and my computer still works, although im having trouble with after effects working still cause its being a douche. but anywho, this keygen will work for ya. ill post one for cs3 in a minute
actually, heres a serial number that that one generated, so you dont have to download it.
remember though, this one is only for cs4 and in a bit ill try posting one for cs3