System not recognised after failed 10.6.6 update

Hi,
A colleague of mine had an error while installing 10.6.6 on a MacBookPro; I was not able to understand which kind of error, anyway now I'm trying to save the situation.
If I just try to boot, after some minute a stop sign appears in place of the apple.
Disk utility does not report any error.
If I look at the disk as firewire target, files are there, plus an unexpected deferred install folder.
If I try to update from combo, I'm not allowed, perhaps because the system is not recognised.
The same if I try to downgrade to 10.6.3 from the original disk: I'm not presented with Archive&install, preserve user and network option that would be good for that. I can only install as if the disk is new, but I would prefer not to loose contents. What if I go this way? User files remain available?
No Time machine backup available too. I could copy files on another disk, this is possible through firewire, but if possible I would avoid to reconstruct configuration by hand.
Thanks.

Final update: I surrendered. I tried to cancel some of the folders in the target disk, but I was not able to install the system over. So I saved the user home folder, formatted and installed from zero. I felt like a Windows user .

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