Activity Monitor no longer works, but icon is there

Recently, my Activity Monitor App in the Utilities folder stoped working. You try to load it up , but it won't start up.
Is there a way to relaod this app without having to reload the OS X Panther, and do all the updates again?

Open the Terminal in the /Applications/Utilities/ folder and run the following commands:
sudo chmod 4775 "/Applications/Utilities/Activity Monitor.app/Contents/Resources/pmTool"
sudo chown root:admin "/Applications/Utilities/Activity Monitor.app/Contents/Resources/pmTool"
Press Enter and type in your administrator password as necessary; when done, the Activity Monitor should open properly. Additionally, if you deleted some or all of the receipts from the /Library/Receipts/ folder, the ability of the Disk Utility to repair your permissions will be affected; you may need to reinstall Mac OS X to get the receipts back.
(10893)

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