This is a security feature. The directory is protected. This prevents program from launching themselves in this hidden manner without authentication. Sounds like someone viewed that directory, creating a .DS_Store. This file is used by Finder to save view preferences for a folder (I believe).
You can use Terminal to delete the .DS_Store.
Be careful with Terminal, and especially with the rm command:
1. Run "Terminal". Search for it using the magnifying glass in the upper right corner (Spotlight).
2. Wait for the prompt "something$".
cd /Library/StartupItems/ [and then press the Return key]
(*must* be capitalized as shown above)
ls -al [press Return]
5. You should see .DS_Store as one of the files listed.
6. Type (*caution* type it exactly as below):
rm -i .DS_Store [press Return]
7. That's it. The "rm" command will delete the .DS_Store", first asking for your confirmation. (If it tries to delete anything else, press and hold the Control key and then press C. The -i flag asks for confirmation before deleting, to avoid possible disasters.) Press Command-Q to quit Terminal.
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