Then, select the “Recovery HD" volume.
Wait for “OS X Utilities” menu to appear (DO NOT CHOOSE TO INSTALL)
Choose Disk Utility from the available options.
In Disk Utility, select your normal, bootable hard drive volume from the list in the sidebar (usually "Macintosh HD").
Then, Click "Repair Disk" (or First Aid)
If it finds errors, repeat the process until it reports the drive is OK.
Next, click "Repair Disk Permissions" if available.
Once the process has completed, choose “Disk Utility” > “Quit Disk Utility” in the menu bar at the top of the display.
Then, restart your Mac and it should hopefully boot back into your normal Desktop.