Other versions of SAS you may have should be uninstalled prior to installing SAS EM. The minimum requirements for this installation are a Windows 7 PC with at least 4GB of RAM (8GB or more would be much better) and at least 20GB of free hard disk space.
The main components that are installed with the SAS 9.4 Enterprise Miner package include:
Instructions for Windows 7 32-bit OS should be similar. The following instructions cover installing SAS Enterprise Miner version 14.1 that is part of SAS 9.4 under a Windows 7 64-bit operating system.