How to find and remove corrupted files?

Hi,
Can anyone give me some direction in locating and removing files that have been corrupted? I am trying to back up my system for the first time on time machine, and keep getting an error message. I visited an Apple store today for support and had them reformat my external drive. I am able to start the backup, but it quits and gives me an error message.
Thanks!

fatchay wrote:
my HD needs to be repaired and that I have an invalid directory count. Is this why I can't backup?
Run Repair Disk: Boot from install disc (insert disc>restart>immediately hold down c key and keep holding it until you see “Preparing Installation”)>at first screen select the language and click Continue> click on the Utilities Menu in the menu bar>open Disk Utility>select your HD in the panel on the left side>click Repair Disk at bottom of main window. Run this at least twice, and keep running it until it says “appears ok” twice in a row. If that doesn’t happen, you may need a stronger utility such as DiskWarrior or if the directory is damaged beyond repair, you may need to reinstall the OS, or you may have a damaged HD (repair utilities can only repair the directory structure, not the HD itself).

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How to find and remove corrupted files?

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