These is the log in %TEMP% folder. Help me please..
2012/7/12:08:15:33 john GFORCE6100PM-M2 === Setup started on GFORCE6100PM-M2 by john ===
2012/7/12:08:15:49 john GFORCE6100PM-M2 === Setup ended ===
2012/7/12:08:15:43 john GFORCE6100PM-M2 === Setup started on GFORCE6100PM-M2 by john ===
2012/7/12:08:17:55 john GFORCE6100PM-M2 Install DirectX 9.0 Runtime Succeeded
2012/7/12:08:19:45 john GFORCE6100PM-M2 Install Autodesk Material Library 2011 Succeeded
2012/7/12:08:20:01 john GFORCE6100PM-M2 Install AutoCAD 2011 Failed Installation aborted, Result=1603
2012/7/12:08:21:28 john GFORCE6100PM-M2 Rollback Autodesk Material Library 2011 Failed Installation aborted, Result=1603
2012/7/12:08:21:29 john GFORCE6100PM-M2 Rollback DirectX 9.0 Runtime Failed Failure is ignored, Result=1620
2012/7/12:08:21:35 john GFORCE6100PM-M2 === Setup ended ===
2012/7/12:08:36:04 john GFORCE6100PM-M2 === Setup started on GFORCE6100PM-M2 by john ===
2012/7/12:08:36:14 john GFORCE6100PM-M2 === Setup ended ===
2012/7/12:08:36:08 john GFORCE6100PM-M2 === Setup started on GFORCE6100PM-M2 by john ===
2012/7/12:08:36:57 john GFORCE6100PM-M2 Install Microsoft Visual C++ 2008 Redistributable (x86) Succeeded
2012/7/12:08:37:12 john GFORCE6100PM-M2 Install DirectX 9.0 Runtime Succeeded
2012/7/12:08:37:43 john GFORCE6100PM-M2 Install Autodesk Material Library 2011 Succeeded
2012/7/12:08:38:22 john GFORCE6100PM-M2 Install Autodesk Material Library 2011 Base Image library Succeeded
2012/7/12:08:38:35 john GFORCE6100PM-M2 Install AutoCAD 2011 Failed Installation aborted, Result=1603
2012/7/12:08:38:58 john GFORCE6100PM-M2 Rollback Autodesk Material Library 2011 Base Image library Succeeded
2012/7/12:08:39:46 john GFORCE6100PM-M2 Rollback Autodesk Material Library 2011 Succeeded
2012/7/12:08:39:46 john GFORCE6100PM-M2 Rollback DirectX 9.0 Runtime Failed Failure is ignored, Result=1619
2012/7/12:08:39:47 john GFORCE6100PM-M2 Rollback Microsoft Visual C++ 2008 Redistributable (x86) Failed Installation aborted, Result=1619
2012/7/12:08:39:52 john GFORCE6100PM-M2 === Setup ended ===
2012/7/12:08:43:07 john GFORCE6100PM-M2 === Setup started on GFORCE6100PM-M2 by john ===
2012/7/12:08:43:17 john GFORCE6100PM-M2 === Setup ended ===
16xx error is generally user rights issue. Don't know if the user "john" has admin right, but I would suggest you try to use your system default admin user "administrator" to install the product, and close any other applications, especially, anti-virus and firewall including the background processes.
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Can you teach me how to make "john" as administrator, my computer has 3 user accounts because my aunt and brother use it too. So help me.