during the installation this error: Can not use system extension system extension

hi,
my configuration is:
mac pro 8 core
nvidia 8800 GT
snow 10.6.2

during the installation this error:
Can not use system extension
system extension “/ system / library / extentions / IOFireWireWDHID.kext” was not installed properly and can not be used. try reinstalling …
I tried both version 2.3.0, 2.3.0a, 2.3.1, and the 2.3.1a but gives me the same error as I do? thanks

I also tried to fix the disk permissions but nothing

I finally solved

How did you solve it?
I am facing this issue now\

Thank you