I have the same problem

try using your live cd and push F8 and then type this "rd=disk0s*"

* being the partition you installed it on (also assuming that you have one hard drive)

and can you get all four of your cores working?

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SportsGuy
Dell Studio Desktop 540
Intel Core 2 Quad 2.83 GHz Q9550 (All cores work)
EVGA nVidia GeForce 9500 GT (1GB) (Works)
M-Audio Fast Track Ultra Sound (Works)
Realtek Ethernet (Works)
8 GB DDR2 RAM (Of course works)
24" Dell 1920x1080 16:9 Monitor
Tri Boot with Snow Leopard 10.6.3 (64-bit) and Vista (64-bit) and Linux Mint