I was just wondering if I could install Darwin to a partition that already had OS X86 10.4.5 on it. My current installation doesn't have the Darwin bootloader, I use Acronis OS Selector to switch from XP Home Edition and OS X. This is annoying becuase I would like to be able to change my boot settings. Do I have to erase the OS X partition, make a new one, install Darwin, and then install OS X again? Or can I install Darwin without destroying OS X?

Hmm... It's a strange problem. I think you should ask for support@acronis.com. They always give a very valuable and qualified help.