Logoff Script Take 2-3 min

Question

Hi All,
  I have create user logoff script to uninstall software. Now i have two issues.
 1. Take long to logoff
 2. How do i allow only once? 
$ArgumentsStandard =" /quiet "
$ArgumentsStandard +="/norestart"
$App = Get-Content "\\server\share\un-installApp.txt"
#gwmi gets the list of applications
# where selects just the apps im interested in removing
# start-process removes each app using msiexec with quiet and norestart options
Write-Host "start un-installing software from list"
gwmi win32_product |
where { $App -contains $_.Name } |
ForEach-Object {
Write-Host "start un-installing $_.name"
$Arguments = "/uninstall "
$Arguments += $_.IdentifyingNumber
$arguments += $ArgumentsStandard
Start-Process "MSIExec" -ArgumentList $Arguments -wait

Answer 1

Hi Martin,
  I don't know how to do this in PowerShell So can you help me with the if  code? 
if exist "c:\cid3.txt" goto end
$ArgumentsStandard =" /quiet "
$ArgumentsStandard +="/norestart"
$App = Get-Content "\\server\Softwareshare\un-installApp.txt"
#gwmi gets the list of applications 
# where selects just the apps im interested in removing 
# start-process removes each app using msiexec with quiet and norestart options 
Write-Host "start un-installing software from list"
gwmi win32_product | 
where { $App -contains $_.Name } |
ForEach-Object {
Write-Host "start un-installing $_.name"
$Arguments =  "/uninstall "
$Arguments += $_.IdentifyingNumber
$arguments += $ArgumentsStandard 
Start-Process "MSIExec" -ArgumentList $Arguments -wait
New-Item c:\cid3.txt -type file
:end