When you try to install the Catalyst 9.x drivers for your ATI Radeon video card on Windows 7 RTM on a machine with an Intel ICH9 chipset, the installation blue screens at the device detection phase.
You have a USB device plugged in that isn't compatible with the Catalyst device detection routines.
Unplug every USB device except for your keyboard and mouse. If your system has a Windows SideShow device on it, you may have to disable it in the BIOS.
After doing this, reboot your machine.
Install the drivers.
After a successful install, reboot your machine.
Plug everything back in.