I get an "install failed" message. "Recovery system can't be created-click restart to return to previous version of OS X." This doesn't work. My Mac continues to try to install Mountain Lion. What is the elegant way to get my system back?

I get an "install failed" message. "Recovery system can't be created—click restart to return to previous version of OS X." This doesn't work. My Mac continues to try to install Mountain Lion. What is the elegant way to get my system back?

The first time I attempted to install ML was on a late 2011 MBP.  It ran for three minutes then gave me the error message: Could not install OSX due to an unexpected error.  I was using the original ML install app, not a USB or other drive.  
After a couple of restarts wiht the same result I saw a message to the effect that the install was trying to close open apps.  I closed apps  manually a few times to no avail.  I shut down instead of restarting then booted into Safe mode (hold down the shift key when starting) and that did it.  The install went smoothly after that. 
I since installed ML in two iMacs using a cloned copy of the install app on a USB drive.  This time I shut down the computers and booted into Safe Mode first and there were no problems. 
I don't know if this issue is the one causing you these problems but it is a simple enough solution to try.
Jay

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