Security Icon in System Preferences Disappeared

Just recently I have a recieved a Wireless Mighty Mouse and in the process of installing the software that came with it, my security icon in System Preferences has disappeared. It shows a lightswitch instead. Any ideas? Here is a picture:
http://img102.imageshack.us/img102/8378/picture1db0.png

thefarky,
Quit System Preferences if it's running and trash the following file:
Macintosh HD/Users/yourusername/Library/Caches/com.apple.preferencepanes.cache
Then launch System Preferences and hopefully the Security Icon will return to normal appearance.
;~)

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http://discussions.apple.com/category.jspa?categoryID=116
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
These steps are to be taken while booted in “normal” mode, not in safe mode. If you’re now running in safe mode, reboot as usual before continuing.
Below are instructions to enter some UNIX shell commands. The commands are harmless, but they must be entered exactly as given in order to work. If you have doubts about the safety of the procedure suggested here, search this site for other discussions in which it’s been followed without any report of ill effects.
Some of the commands will line-wrap or scroll in your browser, but each one is really just a single line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then either copy or drag it. The headings “Step 1” and so on are not part of the commands.
Note: If you have more than one user account, Step 2 must be taken as an administrator. Ordinarily that would be the user created automatically when you booted the system for the first time. The other steps should be taken as the user who has the problem, if different. Most personal Macs have only one user, and in that case this paragraph doesn’t apply.
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☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
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☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Terminal in the page that opens.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign (“$”) or a percent sign (“%”). If you get the percent sign, enter “sh” (without the quotes) and press return. You should then get a new line ending in a dollar sign.
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Hi ...
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edited by: cs

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com.apple.systempreferences.plist
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Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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C. Insert Mac OS X installer CD and when it mounts, navigate to .... Menu->Go->Go to Folder.
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/Volumes/disc name/System/Installation/Packages (where disc name is the name of the CD/DVD that you inserted.
• Click on the "Go" button .....
• Drag a .pkg to Pacifist..... proceed to step 7.
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Stop
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My user icon has disappeared in my system preferences folder, So i'm unable to edit the accounts.
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nerowolfe wrote:
eggszacly wrote:
My user icon has disappeared in my system preferences folder, So i'm unable to edit the accounts.
does anybody have a suggestion?
Welcome to Apple Discussions:
Do you mean the System Preferences Panel? Under Accounts?
There is no systems preferences folder that I know of.
Does your home icon show up in Finder on the left under Places?
You need to better describe what the problem is.
I'm sorry, Yes I mean the system preference panel icon on my desktop. Under Accounts..
Only that it is the Accounts that has disappeared. I'm still not sure if I've described it accurately..

Security Icon in System Preferences Disappeared

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