Recovery HD Locks, Unable to Repair Disk

Experiencing a slow computer and erratic behavior I have run the disk utility.  Repair disk unavailable so ran Verify Disk.  It was unable to complete this process and directed me to restart the computer holding Control R until Apple logo appears.  This brings up the disk utility and I used down arrows to highlight the repair disk option.  Then nothing works.  Tried to hit return, continue button etc but nothing happens.  Must turn off with the power button and start again.  Have tried this several times with no success.
I have a MacBook Air Late 2010 running OSX 10.9.4.
Thanks for any feedback you can provide
Peter

The startup drive is failing, or there is some other internal hardware fault.
Back up all data on the drive immediately if you don't already have a current backup. There are ways to back up a computer that isn't fully functional—ask if you need guidance.
Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.
*An SSD doesn't need to be zeroed.

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    Your problems started when you used AppDelete, it searches for files and can accidentally delete some files as well.
    You should never use such a program, it's no subsitute for the developers uninstaller.
    Because your issues reside in the Applications folder, a global use, your going to have to perform a backup, erase and resintall of Lion, all your programs and return of files from backup.
    As you learned, a OS X overwrtie install isn't going to work.
    Also when you use Disk Utility to Erase the Lion Parititon, use the Erase>Security Opiton> Zero aspect, it takes longer but maps off failing sectors which may be responsible for your issues and ones in the future.
    Map off as many as these failing sectors as possible, with Zero Erase and Erase Free Space once in awhile. SSD owners need not apply.

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