Mountain Lion can't install but won't let me quit the installer!

Mountain Lion can't install but won't let me quit the installer! How can I get back to the desktop?

I was having the same problem with my iMac. Couldn't left click with the wireless mouse, i tried all the steps above to no avail. I then tried to use another mouse, this time bluetooth and still had the same problems. I decided to see if my trackpad, which sits in the corner of my desk and never gets used, and then i realize that my cat is lying on top of the trackpad which was causing my problem the whole time.
I hope your fix was as simple as mine.

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