Help~~~~~~~~ BomFileError 1 in installing iATKOS 10.5.7
 

I've encountered a vital error in installing leopard iATKOS 10.5.7. With searching for help for a really long time, that problem remains unsolved. It's as described below：
Install Failed： the installer could not install some files in to your disk /Volume/iATKOS 10.5.7
text in the install log:
BomFileError 1: Operation not permitted -/Volume/iATKOS v7 1 //System/Library/CoreServices/BootX
pkgExtractor exited with Error 1 while processing package '/System/Installation/Package/10.5.7.Intel.pkg'

Does anyone have any idea?
thx in advance