I've installed Mint 14 Cinnamon edition (32bit) successfully alongside Win 7 Ultimate (64bit) yesterday and it all went well. I didn't like the default settings of the Grub boot loader so I tried installing it through the Terminal using instructions from here - http://www.noobslab.com/2012/11/install ... buntu.html
It was OK until it showed me that it tried to load some untrusted keys. I dunno what to do - it is obviously not installed properly because it doesn't show in the Menu.
Screenshot - http://i49.tinypic.com/15npr38.png