MacBook Pro will not go past login screen/gray screen/gray Apple screen. Wheel keeps spinning.

I am pretty frustrated right now as anyone would be if this happened.
I was installing Anti-Virus onto my MacBook Pro and the installation finished but the computer froze. I force restarted the computer and it went all the way into my desktop, I could click on certain things but it was loading INCREDIBLY slow. The Anti-Virus opened and everything but the computer was just running much to slow and then froze again.
I hard reset the computer again because it was frozen. The first time I hard reset it went all the way to the login screen, I put my password in and the wheel would just spin. It just keeps spinning and spinning and spinning and spinning.
I hard reset the computer again. This time it gets to the Apple logo with the spinning under the logo. Just keeps spinning.
I hard reset the computer again. This time it gets past the spinning under the logo and isn't doing anything.
I hard reset the computer again. Get's all the way to the log in password screen, doesn't even let me put the password in just keeps spinning.
I continued to hard reset and get different screens each time.
I booted into safe mode. Did absolutely nothing for me but run incredibly slow and lag. I am not sure if that is normal or not, as I have never safe booted on a Mac. I reinstalled Mountain Lion after going into I think it was Recovery Mode (Command + R) and that did absolutely nothing for me after waiting over an hour. So now I am very frustrated as I need to do work for my class and this is just a major problem.
I even tried doing the Command + Option + P + R or whatever it was to reset those settings. Nothing is working.
Final projects and computers that don't want to work are not good.

Are you not able to install OS X, then? That is, the reinstall procedure does not work? If so, then you need to erase the drive then reinstall OS X.
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
  1. Select Disk Utility from the main menu and click on the Continue button.
  2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
  3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
  4. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

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