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How can I have powershell run the silent uninstall first, wait until it is finished, and then run the install? After researching I did as below, which works, but the blank Notepad window pops up and I had to close it.

I don't want the user to get any notepad window when I deploy this to them, simply uninstall and then install.

Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -eq "On-Screen Takeoff"} | foreach-
object -process {$_.Uninstall()} 

Notepad.exe | Out-Null

$arguments="/quiet"
Start-Process "\\davisconstruction.com\ROOT\Installs\OnCenter\OST\Testverion3906\ost3906.msi" $arguments
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  • What is the point of calling notepad? – MDMoore313 Sep 19 '13 at 14:16
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I use uninstallw for this task, then I can easily

start-process  -path $Path -arguments $arguments -wait

-wait is what you're looking for, functions just like start "" /wait .... in batch does.

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  • Just so I understand, I would take out Notepad.exe | Out-Null and instead I would just use -wait after my 1st script when I run the whole thing? thanks – Sagun Sep 19 '13 at 14:33
  • Yeah, I don't see what running notepad accomplishes, so I would remove it. Basically, you would run start-process -path $PathToUninstallw -arguments $UninstallwArguments -wait' for the uninstall, then another start-process` for the installer, again with -wait. – MDMoore313 Sep 19 '13 at 14:38
  • I'm all set I was able to call a batch uninstall file pause for about 30 seconds and then run the uninstall. This is thanks to some other forums and feedback from other folks. All this ran silently so I am set thank you for your feedback. Start-process "<path>" Start-Sleep -Seconds <#> $arguments="/quiet" Start-process "<path>"$arguments – Sagun Sep 20 '13 at 18:49

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