Help Needed. Snow Leopard wont Boot

I have decided to try snow leopard again but I cannot get it to boot.

I have a USB formatted with the snow leopard retail dvd, that is plugged into my computer. I am also using a USB dvd rom drive for IBoot.

I have tried IBoot, EmpireEFI.etc but i always get a system hang on the installer:

Trying to change a collection in the registry
Backtrace 0x4ff64 0x530e5d 0x25dfc6c3 0x25df1c73 0x25df5a9e 0x537085
Kernel Extensions in backtrace (with dependencies):
com.apple.driver.AppleACPIPlatform(1.3)@0x25def000->0x25e2ffff
dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0x25d85000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x25da1000
Trying to change a collection in the registry
Backtrace 0x4ff64 0x530e5d 0x25dfc6c3 0x25df1c73 0x25df5a9e 0x537085
Kernel Extensions in backtrace (with dependencies):
com.apple.driver.AppleACPIPlatform(1.3)@0x25def000->0x25e2ffff
dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0x25d85000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x25da1000

I also get the same message at the top of the screen just before NullCPUPowerManagement::start

I have also tried every boot flag i can thing of:
-x32 -f -x arch=i386 -s acpi -v
-x32 -f -x arch=i386 acpi=off -v
-x32 -f -x -v
-v -x32 arch=i386

Nothing works.

My machine is a AcerPower F6 with a Core 2 Duo E6? (Works with vanilla kernel)
It has a ATI Radeon Xpress 200 chipset (ATA,etc) My harddrive is IDE.

I had this working before with snow leopard but it doesnt work now.

,
Spark*