When I turned my Macbook on and signed in, it has been shutting down automatically and restarting itself immediately after opening the desktop. The error message said, I'd shut down my computer unexpectedly. How can I get it to stop shutting down on me?

Since downloading OS X Mavericks, my computer has been shutting down midway of starting up. Please help! The problem began after downloading the software free update. Now when I start my computer, it will starts up normal but when the desktop appears, there will be an error message that I shut down my computer because of an error and if I would like to open the applications that were open before the sudden shut down I should press continue. Then when I select continue, it will open up another communication window that my computer is restarting because of an error. Then the screen will revert to shutting down and restarting again. This has been going on now all morning. Can someone hlep me on how to resolve this issue?

Very Important, how much Free Space is on your Hard Drive first of all? Click on the Macintosh HD on the Desktop, then do a Get Info on it.
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
Do they launch OK while in Safe Mode?

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