I get the same message. I checked the MD5 on my ISO, and re-burned the DVD. Still no good. Checking the install log, it seems that it fails to repair permissions on everything.
There are several lines like this:
Dec 31 14:21:05 localhost runner: postflight: Warning: SUID file "usr/libexec/authopen" has been modified and will not be repaired
and then there's this:
Dec 31 14:21:25 localhost OSInstaller: Removing temporary directory "/Volumes/Macintosh HD/BaseSystem.pkg.146cbKFR0"
Dec 31 14:21:25 localhost OSInstaller: Could not remove directory /Volumes/Macintosh HD/BaseSystem.pkg.146cbKFR0
Dec 31 14:21:26 localhost OSInstaller: Install failed: The Installer encountered an unknown error that failed the install. Contact the software manufacturer for assistance.
Asus P5LD2 (Rev 2.0)
intel c2d 2.66ghz
300gb sata hdd
256mb geforce 7300
Execute Disable Bit: Enabled
ACPI 2: Enabled