Crash while rebuilding library + possible solution

Question

because i had a very slowly responding aperture i went through all the comments on what to do, and in the end i deleted the cache files, defragged my hard disk and rebuild the library (using the aperture startup rebuild dialog)
while it was doing the rebuilding of the library it crashed over and over after going through a few hours of rebuilding.
i found out that my backup client to carbonite was the reason (still no excuse for aperture to crash) so i switched off the backup for a while, let the rebuild finish and switched it back on again.
just posting this so if other people have the same problem to check switch off their backup clients (time machine is alright i noticed) and try again.
oh, and it also did fix my unresponsive aperture.
cheers,
tom

Answer 1

Just an upgrade. The problem is that when I click on the install button and later skip there is a screen that says:
Install Failed
Mac OS X could not be installed on your computer
The Installer encountered an unknown error that failed the install.
Contact the software manufacturer for assistance.
Click restart to restart your computer and try installing again.
Any way to resolve this problem (such as commands in the terminal-mode etc.)?