Error in upgrade will not boot up

Clicked to install updates.  Went through the process, then window popped up saying there was an error and to restart.  Ever since cannot boot the computer up.  Using command-R takes me to "choose", but my wifi is not there and when I input it and the password, circle just spins and spins and never does anything else.

Hi MelonieM,
Thanks for visiting Apple Support Communities.
If your MacBook Air does not start up to Mac OS X, I recommend first resetting the NVRAM / PRAM by following these instructions:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
You can find these steps and more information here:
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
If your computer still does not start up, try booting to safe mode next:
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Start your Mac, then immediately hold the Shift key. This performs a Safe Boot.
Advanced tip: If you want to see the status of a Safe Boot as it progresses, you can hold Shift-Command-V during start up (instead of just Shift).
Note: A Safe Boot takes longer than a typical start up because it includes a disk check and other operations.
If your Mac starts up as expected, immediately try restarting.
More information about safe boot can be found here:
Mac OS X: What is Safe Boot, Safe Mode?
http://support.apple.com/kb/ht1564
Best,
Jeremy

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