Photoshop elements will not run

  J. I. 14:27 07 Mar 2008
Locked

My friend suddenly finds when he launches photoshop it displays a dialogue box that states (you do not have permission to run this program)
When he clicks on the cross of the dialogue box photoshop dissapears from desktop. He has removed and reinstalled the program with the same results.He's now at a stage he does'nt know what to do next. Has anyone experienced this problem and knows the answer he will be very appreciative. He has windows xp and is the sole administrater. Any help greatly appreciated
Joni

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