Hi h8inmyMBP,
Thanks for visiting Apple Support Communities.
If you can't log in to your user account, try logging in with your login items disabled:
OS X Mountain Lion: Open items automatically when you log in
http://support.apple.com/kb/PH11177
Temporarily prevent items from opening automatically when you log in
- If you see the login window, press the Shift key while you click the Log In button, and then release the Shift key when you see the Dock.
- If you don’t see the login window, start your computer, hold down the Shift key when you see the progress bar in the startup window, and then release the Shift key after your desktop appears.
If you're able to log in with this method, see the steps in the article above to "Permanently prevent an item from opening automatically when you log in."
If you're not able to log in with the above method, try booting into safe mode next:
Mac OS X: What is Safe Boot, Safe Mode?
http://support.apple.com/kb/ht1564
Mac OS X: Starting up in Safe Mode
http://support.apple.com/kb/HT1455
Best,
Jeremy