Mountain Lion will not complete install

I have an early 2011 MacBook Pro currently running 10.7.4. I have tried twice to complete Mountain Lion install. Both times I have gone to the app store and downloaded OS. I start install which takes about an hour. Once it's finally done, it reboots the laptop. I login as usual and it's as if nothing has happend. OS is unchanged and still at 10.7.4. I didn't get any errors or warnings during install, so not sure what is happening. Before trying for a second time, I booted the recovery partition and fixed permissions on main partion. It didn't help.
Help! What's happing?

Do you have FileVault enabled?

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Mountain Lion will not complete install

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