Could not install Windows 7

I am trying to install Windows 7 with my computer with AMD Sempron Processor 3200; I upgraded to 2GB of RAM, 500GB of HDD and nVidia GeForce 6150SE nForce 420. When in the process of completing the installation, my computer restarted and ends up with the error below. I am booting from my CD/DVD-ROM and with the correct Windows 7 installation disk.
But the installation always failed to continue. From the specs I mentioned above, is this compatible with Windows 7? Or is there any other issue behind it?
Help me please.

Install Windows
This version of Windows could not be installed.
Your previous version of Windows has been restored, and you can continue to use it. Before trying to install this version of Windows again, check online to see if it is compatible with your computer. Go to the Microsoft website (www.microsoft.com) and search for "upgrade advisor".
