Cannot use the application "Safari" with Leopard

When I try to open Safari in my non-admin account I get an error message reading 'You cannot use the application "Safari" with this version of Mac OS X'.
Bizarrely, if I logon as the admin account it works perfectly.
I have repaired permissions, run software update, repaired permissions again, logged in as SU and fscked and still the same thing. I discovered that Omni Outliner would open the plist but I don't have the knowledge to interpret that.
I think I have used Safari on this laptop since upgrading to Leopard. Most of the time I use Firefox so it hasn't been an issue anyway. The really bizarre thing is it works normally in the admin account.
All suggestions welcome.

Thanks for that. Tried it to no avail
I have found out what has gone wrong but I have no idea how.
I keep all my browsers in a subfolder of the applications folder. I trashed Safari with the intention of downloading a clean version from the Apple website. When I got there I couldn't find a version for OS X (there may be one, it just isn't obvious). So I thought I'd just try Safari one more time from my admin account. Of course the app wasn't in the browser folder. So I went to put it back in the applications folder with the intention of moving it from there to the browsers subfolder.
But no. There was already a newer version in the applications folder. How did it get there? I have no idea. But it opens. So I've moved it to the browsers subfolder and it still works.
So problem solved. I don't understand how it happened. And especially why it worked all along in the admin account.
Thanks to everyone who suggested solutions.

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answer is here:
http://discussions.apple.com/thread.jspa?messageID=5892563&#5892563

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Message was edited by: Rachel R

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10.5.2: You cannot use the application "System preferences.app" with...

Hello
after (successfully) updating from 10.5.1 to 10.5.2, the System Preferences.app cannot be started. Either the application does not start (a silent error) or there is a message "You cannot use the application "System preferences.app" with this version of MacOS X." The version is 10.5.2, according to "About this Mac", while the application version is 3.5. The same happens when I attempt to open "Time machine preferences" using the new menu/icon on the bar.
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Cannot use the application "Safari" with Leopard

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