OS X Maverick - cannot get out of the screen. Can you help?

Re S Maverick - can you help!  I cannot download and it keeps asking to restart and goes back into the OS X Maverick window so I cannot get into Applications or any other screen to try and delete anything in there to start again. I have pressed 'exit OS X Maverick' but it just restarts in the same window ie I cannot get into System Preferences or anything.  It says the disc is damaged but does not give me the option to restore either (I cannot believe itis damaged either cos it wasn't before I started to try and download this piece of software!!)

Restart or reset your iPhone, iPad, or iPod touch - Apple Support
Working now? If not, ask yourself what may have changed just preceding the misbehavior? Add and App? Update one? Update iOS? Anything.
Use iTunes to restore your iOS device to factory settings - Apple Support
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