Anti-Spam Powershell Script Error

I keep getting this error when I try and run the antiSpam powershell on my exchange server.
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PS C:\program files\microsoft\exchange server\scripts> ./install-antispamagents.ps1
Get-ItemProperty : Cannot find path 'HKLM:\SOFTWARE\Microsoft\Exchange\v8.0\Setup' because it does not exist.
At C:\program files\microsoft\exchange server\scripts\install-AntispamAgents.ps1:24 char:33
+ $InstallPath = (get-itemproperty <<<<  HKLM:\SOFTWARE\Microsoft\Exchange\v8.0\Setup).MSiInstallPath + "TransportRoles\agents\
"
    + CategoryInfo          : ObjectNotFound: (HKLM:\SOFTWARE\...ange\v8.0\Setup:String) [Get-ItemProperty], ItemNotFoundExcep
   tion
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetItemPropertyCommand
 
The term 'get-transportserver' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the
 spelling of the name, or if a path was included, verify that the path is correct and try again.
At C:\program files\microsoft\exchange server\scripts\install-AntispamAgents.ps1:30 char:39
+ $transportserver = get-transportserver <<<<  -id $localservername
    + CategoryInfo          : ObjectNotFound: (get-transportserver:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
 
Failed to find the transport server : cgsrvm-ex02
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Any ideas?