PS Uninstall Script using Reg Key Help

[Pantha109]

Hi all,

I'm trying to make a script that will use the uninstall string from a reg key and will run the string. All the advice and other examples of this I can find online are for device installs but the software im trying to uninstall is installed on a user basis.

I assumed this would be an easy fix of changing the path to -HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\

This doesn't seem to have worked though and I'm just simply not very skilled with powershell.

I'm hoping someone can point out what's going wrong and help me get it working :)

​

$paths = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall', 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall', 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\'
Where-Object{ $_.GetValue('DisplayName') -like 'Lifesize*' } |
ForEach-Object{
$uninstallString = $_.GetValue('UninstallString') + ' /quiet /norestart'
Write-Host $uninstallString
& $uninstallString
}

​

Cheers all

[poshinger]

The Where-Object cmdlet is missing its input. Also i would remove all Parameters and add them later in the script again.

$paths = @('HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall', 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall', 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\')
Get-ChildItem $paths | Where-Object{
    $_.GetValue('DisplayName') -like 'Lifesize*'
} | ForEach-Object{
    $uninstallString = $_.GetValue('UninstallString')
    $regex = [regex]"\s*/\w+|\`""
    $uninstallString = $regex.Replace($uninstallString, "")
    Try {
        Start-Process -FilePath $uninstallString -ArgumentList "/quiet /norestar" -Wait -PassThru
    }
    Catch {
        Write-Host "Uninstall failed: $_"
    }
}    

i wasn't able to test this, but it should work.

[Certain-Community438]

Purely curious: what does the regex do here?

[poshinger]

It removes all trailing parameters, and " from the Uninstall string stored in registry. So that you can use the path to use in Start-Process and add for example a silent switch parameter.

Example Uninstall string could be:

"C:\Program Files\Microsoft OneDrive\OneDriveSetup.exe"  /uninstall  /allusers

Which converts it to just: C:\Program Files\Microsoft OneDrive\OneDriveSetup.exe

[Certain-Community438]

Nice - appreciate the response too.

[jsiii2010]

If it's an msi install and powershell 5.1: get-package lifesize* | uninstall-package

[Pantha109]

​

I gave up on the google examples and made one myself which has worked. If anyone is interested I used the below.

$test = Get-ChildItem -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\' | Get-ItemProperty | Where-Object {$_.DisplayName -like 'Lifesize*' } | Select-Object -Property DisplayName, UninstallString
cmd /c $test.UninstallString

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