function Get-ComputerOS {

[CmdletBinding()]

param(

[Parameter(Position=0,

ValueFromPipeline=$true,

ValueFromPipelineByPropertyName=$true,

Mandatory=$true)]

[ValidateNotNullOrEmpty()]

[Alias('cn', 'host', 'hostname')]

$ComputerName,

[Parameter(Mandatory=$false)]

[Alias('cred', 'login', 'runas')]

[System.Management.Automation.Credential()]$Credential =

[System.Management.Automation.PSCredential]::Empty

)

ForEach ($Computer in $Computername) {

if ($Credential)

{

$OS = (Get-WmiObject -Computer $Computer -Class Win32_OperatingSystem -Credential $Credential).version

}

else

{

$OS = (Get-WmiObject -Computer $Computer -Class Win32_OperatingSystem).version

}

switch ($OS)

{

5.0.2195 {"Windows 2000"; break}

5.1.2600 {"Windows XP or Windows XP 64-Bit Edition Version 2002 (Itanium)"; break}

5.2.3790 {"Windows Server 2003 or Windows XP x64 Edition (AMD64/EM64T) or Windows XP 64-Bit Edition Version 2003 (Itanium)"; break}

6.0.6000 {"Windows Vista"; break}

6.0.6001 {"Windows Vista with Service Pack 1 or Windows Server 2008"; break}

6.1.7600 {"Windows 7 or Windows Server 2008 R2"; break}

6.1.7601 {"Windows 7 with Service Pack 1 or Windows Server 2008 R2 with Service Pack 1"; break}

6.2.9200 {"Windows 8 or Windows Server 2012"; break}

6.3.9200 {"Windows 8.1 or Windows Server 2012 R2"; break}

6.3.9600 {"Windows 8.1 with Update 1"; break}

10.0.10240 {"Windows 10"; break}

default {"Something failed. May need to re-try with the -Credential parameter."; break}

}

}

}