Powershell script to Upgrade custom software MSI packaged (InstallShield) across multiple servers in the domain

Hi People,

Can anyone here please help me in upgrading a custom MSI software that is already installed in multiple Windows Server 2003 and 2008 in my domain using powershell script ?

The following is the script that I've used to restart the service if present but obviously I need to reinstall the application from shared folders named \\FileServer1\folder1\CustomApp1.msi

any kind of assistance and help in modifying this script would be greatly appreciated.

Thanks.

$path = "C:\path\"
$serverlist = get-content "$path\serverlist.txt"
$servicename = "CustomApp1"
foreach ($server in $serverlist) {
	 $result = Test-Connection $server -Count 1 -Quiet
	 if ($result -eq "True") {
		 $ServiceInstalled = Get-Service -name $servicename -ComputerName $server -ErrorAction SilentlyContinue
		 if ($ServiceInstalled.Name -ne $servicename) {
			Add-Content "$path\noservice.txt" -Value ("$server" + " " + "Service $servicename is not present")
		 }
		 else {
			 # Perform Install .MSI package
			 Start-Sleep -Seconds 60
			 sc.exe \\$server stop "$servicename"
			 Start-Sleep -Seconds 5
			 sc.exe \\$server start "$servicename"
			 Add-Content "$path\Installed.txt" -Value ("$server" + " " + "Service $servicename has been upgraded")
		 }
	 }
	 else {
		Add-Content "$path\noping.txt" -Value $server
	 }
 }

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