In some cases, you may not be able to install Autodesk software on Windows Vista or Windows 7.
The log files will basically point you errors that potentially can make you go on a wild goose chase:
2011/5/5:09:05:08 USER 2011-06 === Setup started on 2011-06 by USER ===
2011/5/5:09:05:08 USER 2011-06 Launch
2011/5/5:09:05:36 USER 2011-06 PageOpen LaunchDialog
2011/5/5:09:07:11 USER 2011-06 PageOpen LicenseDialog
2011/5/5:09:08:04 USER 2011-06 PageOpen ProductInfoDialog
2011/5/5:09:08:20 USER 2011-06 PageOpen ProductSelectionDialog2
2011/5/5:09:08:25 USER 2011-06 PageOpen FullProgressDialog
2011/5/5:09:08:25 USER 2011-06 Installing DirectX® Runtime: C:\revit 2012\3rdParty\DirectX\DXSETUP.exe /silent
2011/5/5:09:09:28 USER 2011-06 Install DirectX® Runtime Succeeded
2011/5/5:09:09:28 USER 2011-06 Installing Microsoft VSTA Dependencies (x64) - ENU: C:\revit 2012\3rdParty\x64\VSTA\expdbgsetup.exe /q
2011/5/5:09:09:31 USER 2011-06 Install Microsoft VSTA Dependencies (x64) - ENU Failed Failure is ignored, Result=1618
2011/5/5:09:09:31 USER 2011-06 Installing Autodesk® Revit® Architecture 2012: TRANSFORMS="C:\revit 2012\x64\en-us\RAC2012\RAC2012.mst;C:\User\RAC2012-standalone.mst"
MSINEWINSTANCE=1 ADSK_EULA_STATUS=#1 ADSK_SOURCE_ROOT="C:\revit 2012\" INSTALLDIR="C:\Program Files\Autodesk\" FILESINUSETEXT="" REBOOT=ReallySuppress ADSK_SETUP_EXE=1
2011/5/5:09:09:31 USER 2011-06 Install Autodesk® Revit® Architecture 2012 Failed Installation aborted, Result=1618
2011/5/5:09:09:31 USER 2011-06 Rollback DirectX® Runtime Failed Failure is ignored, Result=1618
2011/5/5:09:09:31 USER 2011-06 PageOpen InstallCompleteDialog
2011/5/5:09:10:22 USER 2011-06 === Setup ended ===
This issue was resolved by turning off User Access Control in Windows Vista or Windows 7.
See also this post: http://forums.autodesk.com/t5/Installation-Licensing/Windows-Vista-Windows-7-and-User-Access-Control...
David Lau