dual boot on GPT error

[howoarang]

Hi, I will try to install Mac OSX Snow and Windows 7 on the same disk with 3 partition, which is formated as GPT disk. So if I tried install Windows 7 to this disk, get error "systam can not be installed on GPT disk"
Can you help me how to make dual booting systems on my laptop dell d630 with one disk in GPT scheme?
Or only solution is format whole disk as MBR

Thanks

[Imkantus]

Windows Vista 64 SP1 and Windows 7 64 prinicpally support beeing installed to GPT scheme, but only on PCs with a mainboard that has an (U)EFI-Firmware, this firmware is anytime soon going to be a BIOS replacement and already beeing used on Intel Macs, it also inclueds an own booting technologie making an external bootloader unecessary.

PC_EFI and the related Chameleon bootlaoder use to emulate a EFI Firmware for using OSx86. And as far as I read it's also possible to install windows to GPT when booting the DVD using your OS X bootloader - but I haven't tried this as I am not interested in using Windows.