How To Remove A Program on Windows Using PowerShell

# removeAppwizProgram.ps1
# Version 0.02

$computernames=@(
    'SERVER0001',
'SERVER0002'
)
$appName='Dell EMC OpenManage Systems Management Software (64-Bit)'
function removeAppwizProgram($computernames=$env:computername,$appName='Firefox'){
    $results=[hashtable]@{}
    foreach($computer in $computernames){
        $session=new-pssession $computer
        if($session.State -eq 'Opened'){
            $result=invoke-command -session $session -scriptblock{
                param($appName)
                write-host "Checking $env:computername..."
                try{
                    # Method 1: try using the Uninstall method of the application packager
                    $app=Get-WmiObject -Class Win32_Product -Filter "Name='$appName'"
                    if($app.Name -eq $appName){
                        write-host "Uninstalling $app"
                        # pause
                        $null=$app.Uninstall()
                        $appStillExists=Get-WmiObject -Class Win32_Product -Filter "Name='$appName'"
                        if($appStillExists){
                            write-host "'$appName' still exists"
                            # Method 2: Using Registry
                            $uninstallStringRegPaths='HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall','HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall'
                            $uninstallStrings=Get-ChildItem -Path $uninstallStringRegPaths
                            $uninstallString=($uninstallStrings|Get-ItemProperty|Where-Object {$_.DisplayName -match $appName}).UninstallString
                            if($uninstallString.count -eq 1){
                                $appCode=[regex]::match($uninstallString,'\{(.*)\}').Value
                                $uninstallCommand="& msiexec.exe /x $appCode /quiet /norestart"
                                write-host "Invoking uninstall Command: $uninstallCommand"
                                Invoke-Expression $uninstallCommand
                                $appStillExists=Get-WmiObject -Class Win32_Product -Filter "Name='$appName'"
                                if($appStillExists){
                                    write-warning "Uninstall has been unsuccessful at removing $appName"
                                    return $false
                                }else{
                                    return $true
                                }
                            }else{
                                write-warning "Please check this/these uninstall string(s):`r`n$uninstallString"
                                return $false
                            }
                        }else{
                            write-host "'$appName' has been removed"
                            return $true
                        }
                    }else{
                        write-host "No matches for $appName"
                        return $true
                    }                   
                }catch{
                    write-warning $_
                    return $false
                }
            } -Args $appName
            $results+=@{$computer=$result}
            remove-pssession $session
        }else{
            write-warning "Unable to connect to $computer"
            $results+=@{$computer=$null}
        }        
    }
    return $results
}

removeAppwizProgram $computernames $appName

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