10.5.3 won't install... stuck in blue screen loop

I chose to install it from software update. It told me to restart. I did.
I got hung up on a blue screen loop.
But no error messages or anything.
I had to hard reset.
Then started up fine- but system profiler shows I'm still 10.5.2.
And software update still shows the update as "downloaded".
If I click "install" it immediately asks me to reboot, and sticks in the blue screen loop again.
I have done this three times now.
If I choose restart from the apple menu- same thing.
So I decided to shut down- can't shut down. Get stuck in the looping blue screen.
So it seems like something is gumming up the shut down process. I've heard of startup items making things freeze- can the same thing happen when shutting down?
Not sure what the issue is.
The other people posting problems seem to be getting error messages, etc.
I am going to try to repair permissions, and if that doesn't work maybe I'll try the standalone installer- but why is this happening? this is like a 2 week old MBA with next-to-no third party stuff installed on it... what could be corrupted already?
fortunately I have backups if worse comes to worse...
Any other tips/thoughts?
Thanks!

Alexroet wrote:
should i try the standalone installer?
You could try, it's been known to sort system issues because it's fuller than the incremental "delta" update, so it should overwrite any files that are damaged or missing.
Remember to Verify Disk before update and repair permissions after update from /Applications/Utilities/Disk Utility.
But if you can't boot into Safe Mode something is amiss*. Since, you are able to use your system (not stuck on blue screen, try this first:
Go to System Preferences >> Accounts >> Login Items and remove them. Boot normally and test. If not go to ~(yourHome)/Library/Contextual Menu Items and move whatever is there to the desktop. Then do the same with /Library/Contextual Menu Items. Lastly, try moving ~(yourHome)/Library/Fonts to your desktop and restarting.
*EDIT: You do have to hold the shift key for Safe Boot until you see the spinning gear, just in case you didn't do that.
-mj
Message was edited by: macjack

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