My system preference, powner off, restart disappeared after installing lion twice! Anybody can help?

After installing Lion on my Imac, the System Preference option in the apple menu (Apple sign on top left side of desktop) has disappeared. In addition, the power off, restart options are gone too. I have reinstalled the Lion twice but the problem hasn't been resolved yet. This is happening when I am logged into adm. user. In other users account, the menu seems to be ok. Any suggestions or recommendation to help me fix this issue?

Let me clarify the issue again:
A number of items have gone missing from my apple menu: Software Update, System Preference, Dock, Recent, Restart, and Shut Down are gone.
All that's left are About, Location, Force Quit, Sleep, and Log Out. Can anybody help?

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Tried to reply with my iPhone but not easy! Anyway, back on the laptop now. Yes the crash was bad but Tek support at Prism Sound was really good. In the end I rebuilt the whole system on a new disk which took a couple of days with all the plugins, softsynths etc.... but there seemed to be no alternative in my case, and this was agreed with Prism sound as being the only alternative left to me. I still don't really know what caused the crash but ML and Orpheus are both working fine now. Let's face it, you'll have to update at sometime..maybe best to pick some time between projects On balance, I suspect that my problems were unique to my system and that your installation will go ok.
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My system preference, powner off, restart disappeared after installing lion twice! Anybody can help?

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