Powershell – How to uninstall Windows Powershell v1.0 on Windows 7 RTM

dism.exe /online /?

also, check out http://www.windowsnetworking.com/articles_tutorials/Deploying-Windows-7-Part2.html

Whilst I'm still not sure exactly what the IIsProviderSnapIn snap-in is compared to WebAdministration, I've ended up with a modified version of an answer to https://stackoverflow.com/questions/1924217/powershell-load-webadministration-in-ps1-script-on-both-iis-7-and-iis-7-5
which loads in the WebAdministration snap-in or module if available, otherwise uses the IIsProviderSnapIn.

$iisVersion = Get-ItemProperty "HKLM:\software\microsoft\InetStp"
$useIISProviderSnappin = $False

if ($iisVersion.MajorVersion -eq 7)
{
    if ($iisVersion.MinorVersion -ge 5)
    {
        Import-Module WebAdministration
    }           
    else
    {

        if(Get-PSSnapIn -Registered | Where {$_.Name -eq "WebAdministration"}) 
        {
            if (-not (Get-PSSnapIn | Where {$_.Name -eq "WebAdministration"})) 
            {
                Add-PSSnapIn WebAdministration
            }
        }
        elseif(Get-PSSnapIn -Registered | Where {$_.Name -eq "IIsProviderSnapIn"})
        {
            #older versions of server 2008 don't have the webadministration module!
            if (-not (Get-PSSnapIn | Where {$_.Name -eq "IIsProviderSnapIn"})) 
            {
                Add-PSSnapIn IIsProviderSnapIn
            }

            $useIISProviderSnappin = $True
        }
        else 
        {
            throw "Unable to import any suitable modules... :( "
        }
    }
}

Function Get-IISWebsite()
{
    if($useIISProviderSnappin)
    {
        return dir iis:\sites
    }
    else
    {
        return Get-Website
    }
}