"Mach reboot" - Problem with a SSE3 CPU

[anilini]

hi...
i read alot about the "Mach reboot"- problem, while install leopard...but i can't
install lepoard, although i' ve an AMD x2 3800+ with SSE3

on a Asus A8N Premium
the Hdd is a Samsung S-ATA
and a Geforce 8600gts

i hope somebody can help me