@Macprodan

You can try the 9.2.0 Kernel, my cpu is SSE3 (Athlon X2 4200+) and it works.

You must select BOTH.

@braindead

If you selected a bootloader then EFI is already installed.
Did you installed Leo on a partition which already contains another OS ?

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Mac OS X 10.6.3 • 2.8 GHz Intel Core I7 860 • ASUS P7P55D • 2 GB 2 Ghz DDR3 • ATI RADEON XFX 4890 1GB • 2 x Hitachi 160 GB Serial-ATA • PIONEER DVD-RW DVR-112 • LaCie Desktop Harddrive 750 GB USB