Windows PowerShell is a new command line shell and task-based scripting technology that provides comprehensive control and automation of system administration tasks. Windows PowerShell allows Windows administrators to be more productive by providing over *00 system administration utilities, consistent syntax, and improved navigation of common management data such as the registry or Windows Management Instrumentation (WMI). Windows PowerShell also includes a scripting language which enables comprehensive automation of Windows system administration tasks. The Windows PowerShell language is intuitive and supports your organization’s existing scripts and command line tool investments. Exchange Server 2007 and System Center Operations Manager 2007 will leverage Windows PowerShell to provide improved command line automation.

Download and install .NET Framework 2.0:
[url=http://msdn.microsoft.com/netframework/downloads/updates/default.aspx].NET Framework 2.0[/url]

Now you can install the powershell:
[url=http://www.microsoft.com/windowsserver200*/technologies/management/powershell/default.mspx]Windows PowerShell[/url]