System Pref. is accidentally deleted

I accidentally draged my system preferances folder to the trash and later emptied the trash bin. I now have the system pref. icon in my dock with a question mark overlapping it and it will not open. Is there any way to restore the system pref. folder and it's contents back?
I know, it was a stupid accident, but I would appreciate the help!!!
Thanks
Macbook

Use Pacifist to extract the items you deleted from your computer's original disks, and then rerun the combo updater for your version of Mac OS X.
(15151)

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[Pacifist Documentation|http://www.charlessoft.com/Pacifist_Documentation/English/index.h tml]
[Kappy: How to Use Pacifist to Replace Deleted or Missing OS X Components|http://discussions.apple.com/message.jspa?messageID=9044169#9044169]

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my sister accidentally deleted System Preferences.
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It's no longer in the /applications folder and won't launch from the dock or the apple menu.
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Is there a downloadable installer for that coz I no longer have the osx install disc.
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System Pref. is accidentally deleted

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