无法在Windows 7上安装SQL Server 2008？

I'm trying to install SQL server 2008 in my computer. It's running 32 bit, Windows 7. However, after a couple of steps, when I reach the point where the installation is showing that it's arriving in "support files of installation", then the setup modal window disapears and does not proceed with the installation.I'm trying to install SQL server 2008 in my com