MAC  OSx Unxpectedly quit

Recently after i shut my computer off i have had a hard time getting it to restart and then once it does restart i get a message that say mac osx has unexpectedly quit, Why is this happening and what can i do about it?
THank you
Mac Book Pro    

Eileen, why do you unplug the computer? That's not necessary, unless you will be gone for days.
How do you turn it off? There's a right way and a wrong way. The wrong way is to do a forced shutdown by holding down the Power button. The right way is to select Shutdown from the Apple menu.
If the computer doesn't boot up properly you have some operating system problems and/or disk directory problems. That can result from forced shutdowns, power problems, or other events that change permissions, corrupt files or caches, etc.
It's time for some routine OS X maintenance. Launch Disk Utility, select your boot volume (probably named Macintosh HD) and run permissions repair. Then run verify disk. If an error is reported, insert your Installation Disc 1 DVD and reboot while holding down the C key. When the installation screen appears, go to the menu and choose Disk Utility. Select your boot drive and run disk repair. If no error is reported, run it again to be on the save side. (Note: if the disk repair routine reports that it cannot fix the problem, more drastic measures will be required. The full version of Tech Tools may be able to fix the problem. Otherwise, you may have to completely wipe your drive (you will lose everything not backed up to another drive or CD) and reinstall the operating system.)
Assuming the situation noted in parentheses above isn't the case, reboot and see if the computer is running properly.
I also recommend routine preventive maintenance with a utility such as OnyX (free) or C ocktail (shareware) that cleans out cache files and runs a number of maintenance processes.

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