Installation error while installing AutoCAD 2012

Hello to all
I have recently tried installing AutoCAD 2012 on my system.
Some its contents get installed successfully most of its components don't seem to get installed.
I get the following error message window on my screen:

The error reads as:
Installation complete. Some product failed to install.
· AutoCAD 2012
An error occurred while installing this product. For more information
View the installation log file
· Autodesk inventor fusion2012
An error occurred while installing this product. For more information
View the installation log file
· Autodesk inventor fusion plug-in for AutoCAD 2012
Intelligently edit and validate 3D models from almost any source,
Helping you experience the benefits of 3D in the native DWG format
Can anyone please explain why am I facing this problem during installation. I am at my wits end now.
Waiting for your replies and comments
Regards
Lopez
