If you want to run iDefrag, try it out. There should be an option in it to create a bootable disc, according to their site. Their site also says it doesn't require a bootable disc, it can run itself before the system starts up I guess. It seems like once you click the option, you simply reboot and it will start up.
I can't be of much more help since I don't have the program myself, but their website's support should give you the help needed to run it properly.
The other option is as I said in the other thread, backup your data, re-install leopard with your install DVD, and run the boot camp assistant again. Hopefully if it runs from a clean install, there would be no problems.