Error when I try to go to Displays Preferences

I've been using an external monitor with my Macbook and everything was working fine yesterday. Now when I click "Displays" inside the System Preferences, I get this error...

"The application System Preferences quit unexpectedly.

Mac OS X and other applications are not affected.

Click Reopen to open the application again. Click Repoert to see more details or send a report to Apple."

So I click "Reopen" and when I hit Displays again, I get this error...

"The application System Preferences quit unexpectedly after it was reopened.

Mac OS X and other applications are not affected.

Click Try Again to temporarily restore the application's default settings and open it again. Click Report to see more details or send a report to Apple."

Can someone tell me what's going on? And what stopped my computer from working like it did yesterday?

HELP!!!

-A

NOTE: Not a Notebook Hardware issue. Moved to Software forums.

Thank you... :/ Sorry about that. Anyone?

Try viewing/repairing disk permissions under Disk Utility. After that, I would probably shut down the computer and then boot back up and try out System Preferences.

Ok, I've never done that before. But I tried it, still isn't fixed. Same errors. Any other ideas??