$tempdir = Get-Location$tempdir = $tempdir.tostring()$appToMatch = '*Microsoft Interop Forms*'$msiFile = $tempdir+"\microsoft.interopformsredist.msi"$msiArgs = "-qb"function Get-InstalledApps{ if ([IntPtr]::Size -eq 4) { $regpath = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*' } else { $regpath = @( 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*' 'HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*' ) } Get-ItemProperty $regpath | .{process{if($_.DisplayName -and $_.UninstallString) { $_ } }} | Select DisplayName, Publisher, InstallDate, DisplayVersion, UninstallString |Sort DisplayName}$result = Get-InstalledApps | where {$_.DisplayName -like $appToMatch}If ($result -eq $null) { (Start-Process -FilePath $msiFile -ArgumentList $msiArgs -Wait -Passthru).ExitCode}