Error Loading Design Model Sim PE student edition 10.1

Hi,

I installed ModelSim PE Student Edition 10.1 on Windows 7 32-bit OS in 
January 2012. I am able to compile the verilog files without any error. 
But when i try to load the design for simulation i get the error message 
as shown below. I copied the "student_license.dat" file into the 
installation directory of ModelSim as specified in email from Mentor 
Graphics.

Please provide a solution to this problem. Thanks in advance.



vsim -coverage work.ones_cntr_tb
# //  ModelSim PE Student Edition 10.1 Dec  6 2011
# //
# //  Copyright 1991-2011 Mentor Graphics Corporation
# //  All Rights Reserved.
# //
# //  THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION
# //  WHICH IS THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS
# //  LICENSORS AND IS SUBJECT TO LICENSE TERMS.
# //
# // NOT FOR CORPORATE OR PRODUCTION USE.
# // THE ModelSim PE Student Edition IS NOT A SUPPORTED PRODUCT.
# // FOR HIGHER EDUCATION PURPOSES ONLY
# //
# vsim -coverage work.ones_cntr_tb
# ** FATAL ERROR: ModelSim PE Student Edition licensing failure due to 
one or more problems with the license key such as:
# - it is not found
# - it has expired
# - it is not for this user
# - it is not for this computer
# - it is not for this version of ModelSim PE Student Edition.
#
# Please go to http://www.model.com and download an updated copy of the 
ModelSim PE Student Edition.
# Error loading design