Need help to get my Macbook Air start up

Just anyone knows about an apple macbook air notebook. I by misstake shut it down doing a software update.... now it wont start up.

Shutting down during an update can be very damaging to the stability of the operating system. It can even render the machine unable to boot.
You should probably try to do a "repair install" of the operating system. What version are you running?
For the moment, assuming you have Lion, boot to the Recovery Partition by turning tre computer on, while holing down the Option key. Select the Recover HD, and boot to it.
First run the Disk Utility to "Repair Disk" and Repair Permissions" on the startup drive partition. Then you can either give it another try to boot up normally, and/or proceed to do a reinstallation of Lion. The reinstallation should not disturb your existing data, but as always that is why you have to maintain a backup regimen, just in case the worst happens.
http://support.apple.com/kb/HT4718
Hopefully after you are finished, all your apps will work as before, and none were damaged during the untimely shutdown which precipitated all of this. Again, if it has problems, the alleviation of such is dependednt on the health of your backups.

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