My MacBook Pro's finder application says: The application Finder can't be opened. How do I fix this?

I have tried all the fixes, but it still won't fix finder, is there any other way to do it. The terminal script didn't work either. Please help.
Thank you.

Disconnect all peripherals from your computer. Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
Restart your computer when done.
If you can now open the Finder, go to - /Library/Preferences and trash the finder plist file.
Repair permissions - http://docs.info.apple.com/article.html?artnum=25751 and restart your computer.
the update to 10.6.8 for free?
Yes.  Use Software Update.
Updates are free.  Upgrades you pay for.

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