Help! After interrupting an installation of a program downloaded from the internet on my mac in a reboot cycle will not start, I've already done the disk check and it's ok and I reinstalled the OS 10.8 Lion

After interrupting an installation of a program downloaded from the internet on my mac in a reboot cycle will not start, I've already done the disk check and it's ok and I reinstalled the OS 10.8 Lion

In this case, I think that there's something damaged that can't be fixed just reinstalling OS X.
If you don't want to lose files, you will have to create a second partition in the hard drive and install OS X there, so you will be able to recover everything you need. Then, you will have to erase the first partition and reinstall OS X. Follow these steps:
1. Hold Command and R keys while your Mac is starting to start into OS X Recovery, and open Disk Utility.
2. You can follow the steps of this site to create a second partition > http://pondini.org/OSX/DU3.html
3. After creating the second partition, close Disk Utility and install OS X on the second partition.
4. When the installation finishes, open Finder and, in the sidebar, you will see the other partition. Open it and recover the files you need.
5. After doing that, repeat the step 1.
6. Select “Macintosh HD” in the sidebar, go to Erase tab and erase the disk.
7. Close Disk Utility and install OS X on the first partition.
After doing all of these steps (you will need a lot of time to do this), you can delete the second partition you created and add the size of this partition into the first one > http://pondini.org/OSX/DU4.html

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