Can Snow Leopard be installed on an MBR partition?

I need to make my MacBook run Windows XP and since i don't have a lot of cash right now i'm not going to go buy Windows7.
I have 2 partitions on my Macbook currently. The drive was originally GUID, but i've sliced it in half with Disk Utility and the second half is now MBR.
I then booted from a Windows XP disc and formatted the MBR partition as NTFS and installed Windows.
Windows seems to work fine for me right now.... BUT I'M SCARED!
Window's XP is Not supposed to be able to understand GUID.
When i try and disable Windows "System Restore" from using the GUID-MacOSX partition, it says ERROR. Probably because it doesn't know what the heck is in that partition.
I would feel much safer if i could just Format the whole drive as MBR and then Make 1 partition for OSX and 1 partition for Windows.
Can OSX 10.6.7 be installed on an MBR partition?

Windows doesn't care about the rest of the drive, only it's own partition. It doesn't understand EFI, either. The Mac has to fool Windows into believing a BIOS exists.
What you have right now is fine.

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