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I suggest you quit iPhoto, hold down the Option/ALT and Command keys and start iPhoto. You will see an iPhoto Library First Aid window, select rebuild the Database.
Just force quit
Go to the Apple Logo to Force Quit and choose iPhoto. I would check your hard drive before doing anything else. Please go to the Apple logo at the upper left of your computer screen to About This Mac and give me this information: The exact system Version (listed right under Mac OS X) Processor Memory
Did you see my question?
I need you to check the drive first. If your system is Lion or above:
Reboot into the Recovery HD by choosing the ‘Apple‘ menu > Restart, then hold down the ‘Command’ + R’ keys on the keyboard during the start up process. When you see the Apple Logo you can let go. When the machine boots you may have to choose your language then you will see the OS X Utilities screen. Select the Disk Utility and then select Continue. Then in Disk Utility select Macintosh HD in the left column (if there are two with that name or it is named something else choose the first indented item) and then select Verify Disk on the right. If that says “OK” in green type then select Repair Disk Permissions. If it is not ok let me know.