I tried many times to turn it on, it turns and the same white screen appears and the update starts again and shuts down. Please Help me!

Hello!
I have a MacBook Air. I have got a software update notification couple of days ago. I've clicked on it today, and it started installing updates.
But, I have got a notification telling that not all updates were installed successfully, then I have clicked on "Restart" from the notification box. Then my Mac restarted and the white screen with Apple logo and the update progress appeared (like what always happens during updates).
The problem that while the update progress reached around half the way, my Mac shutdown. I tried many times to turn it on, it turns and the same white screen appears and the update starts again and shuts down.
Please Help me!
MacBook Air (11-inch Mid 2009)

Welcome to Apple Discussions
You did not state whether you installed the update while on battery (not mains) power. You are warned not to apply certain updates without being connected to a charger & mains power.
Also remove any attached peripherals.
Reboot in Repair mode (command-R at start)  and use Disk Tools-Disk Utility-Disk First AId to repair your disk, and as long as you're there repair permissions. Next quit Disk Tools and reinstall the OS. After completing that successfully reboot, log in and do a combo update.
You must have more than enough (not just enough) empty (free) disk space for the update.

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