Powershell - Checking variable for value in foreach - If no value then log other output - powershell

Question

I'm having issue with my foreach method. I am checking in the registry whether a good amount of programs are installed. How would I write it to say something is not installed one time versus it saying something's not installed for each key it checks? Now, If I place a ElseIf it executes "PowerBroker not installed." about 16 times. This is due to it checking every key and writing it out for each key it does not find a match to the displayname. How do I go about it checking the key and only writing it out one time if it's not installed?? Thanks!
$UninstallKeys = Get-ChildItem 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall'
foreach($Key in $UninstallKeys){
if($Key.GetValue("DisplayName") -Match "BeyondTrust"){
$PBW = $Key.GetValue("DisplayName")
$PBWV = $Key.GetValue("DisplayVersion")
if ($PBW) {
$PBW = $PBW, $PBWV
}
else {
$PBW = "PowerBroker not installed."
$installsmissing = "True"
}
}

Answer 1

Give this script a whirl. If I've understood the requirement correctly it should give you what you need.
$displayName = "BeyondTrust"
$uninstallKeys = Get-ChildItem -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"
# Filter the keys down by their display name property
$specificUninstallKeys = $uninstallKeys |
Where-Object {
$_.GetValue("DisplayName") -eq $displayName
}
# Did we find any keys of that name?
if ($specificUninstallKeys) {
Write-Output "Keys found: $($specificUninstallKeys.Length)"
}
else {
Write-Output "Sorry pal, no keys by that name here!"
}
# There may be more than one; hence the loop-y requirement here.
foreach ($specificUninstallKey in $specificUninstallKey) {
Write-Output $displayName
Write-Output $specificUninstallKey.GetValue("DisplayVersion")
}