Ok, I have installed both files from bigdonkey! It's a pleasure for me to share informations with this fantastic community!
One last question, the dual boot with Windows 7. I have already tried before starting with Mountain Lion on the whole disk. I used disk utility, went to the partition tab, click on the plus (+) button, added one more partition, named and formatted in FAT32. When I rebooted the system with the windows 7 cd in, I have installed windows 7 losing the chimera bootloader. so I booted with unibeast usb stick to get in Mountain Lion desktop and from there I installed chimera bootloader using multibeast. The problem was that chimera wasn't recognize the windows 7 partition.. So no way to complete the dual boot.
I hope I have explained everything well and that you have any suggestions, please.
Thank you RehabMan!