This is for sure an installation issue.
In which OS are you installing AutoCAD 2010?
Which installation method are you using?
Did you log as system Administrator?
Have you disabled your antivirus before installing AutoCAD 2011?
Have you seen relevant error messages in the AutoCAD 2011 Install.log located in the %TEMP% directory?
Regards
Antonio Barroca
Autodesk Product Support
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Antonio Barroca
Product Support Specialist
Autodesk, Inc.