How do I reboot my MacBook Air? It says software is being installed; digital camera RAW compatibility and safari

I am trying to get rid of this "Installation Alert" window.  I tried to force quit all and reboot, but it says "Your computer can't be restarted now, because software is being installed."  Below that it says "Digital Camera RAW Compatibility Update and Safari are being installed.  Interrupting the install Amy damage your computer.  You can restart when the install is complete". It has a progress bar below showing it being 80% complete, but it just hangs there.  Now safari is going crazy.

Then try holding down the Power button for 5-10 seconds until your computer shuts down. Wait one minute then:
Repair the Hard Drive and Permissions - Lion/Mountain Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu. Select Restart from the Apple menu.

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