Remove a file using powershell through admin account - powershell

Question

Brief summary of what I'm trying to do.
I have a script in powershell that takes 2 files and reads in the embedded credentials and stores them in a variable to which then I can run administrative commands from.
This works great, however, after the files are read and the key is stored, I'm trying to delete the 2 files and I keep getting the following error:
Start-Process : Parameter set cannot be resolved using the specified
named parameters. At \mars\Client-Installs\NetSmart
Test3\Setup.ps1:137 char:15
+ Start-Process <<<< -FilePath "powershell.exe" -Credential $adminCreds -WindowStyle Hidden -ArgumentList "Remove-Item -Path
$file1 -Force" -WorkingDirectory $path -NoNewWindow -PassThru
+ CategoryInfo : InvalidArgument: (:) [Start-Process], ParameterBindingException
+ FullyQualifiedErrorId : AmbiguousParameterSet,Microsoft.PowerShell.Commands.StartProcessCommand
Start-Process : Parameter set cannot be resolved using the specified
named parameters. At \mars\Client-Installs\NetSmart
Test3\Setup.ps1:138 char:15
+ Start-Process <<<< -FilePath "powershell.exe" -Credential $adminCreds -WindowStyle Hidden -ArgumentList "Remove-Item -Path
$file2 -Force" -WorkingDirectory $path -NoNewWindow -PassThru
+ CategoryInfo : InvalidArgument: (:) [Start-Process], ParameterBindingException
+ FullyQualifiedErrorId : AmbiguousParameterSet,Microsoft.PowerShell.Commands.StartProcessCommand
The account I'm running with is part of domain admin and when I look in task manager I can see it running in Administrative mode.
I also know that the folder path where the files reside also have full share and security access to.
Here is a snippit of my code (The bottom 2 lines are the ones that don't seem to work)
function Authentication
{
#---------------------------------------------------
#Authenticate Admin Account using encrypted password
#---------------------------------------------------
$TempFolder = $env:temp
#The 2 lines underneath is if you are running the auth files from the same directory
#$global:AESKeyFilePath = $path + "\aeskey.txt"
#$global:SecurePwdFilePath = $path + "\credpassword.txt"
#Move the files to the temp folder
$global:file1 = $path + "\aeskey.txt"
$global:file2 = $path + "\credpassword.txt"
Copy-Item -Path $file1 -Destination $TempFolder -force
Copy-Item -Path $file2 -Destination $TempFolder -force
#If you choose to run it from the temp directory comment the lines above and uncomment the 2 below.
$global:AESKeyFilePath = $TempFolder + "\aeskey.txt"
$global:SecurePwdFilePath = $TempFolder + "\credpassword.txt"
$global:userUPN = "domain\user"
#use key and password to create local secure passwordtemp
$global:AESKey = Get-Content -Path $AESKeyFilePath
$global:pwdTxt = Get-Content -Path $SecurePwdFilePath
$global:securePass = $pwdTxt | ConvertTo-SecureString -Key $AESKey
#create a new psCredential object with required username and password
$global:adminCreds = New-Object System.Management.Automation.PSCredential($userUPN, $securePass)
#Remove the files below
Start-Process -FilePath "powershell.exe" -Credential $adminCreds -WindowStyle Hidden -ArgumentList "Remove-Item -Path $file1 -Force" -WorkingDirectory $path -NoNewWindow -PassThru
Start-Process -FilePath "powershell.exe" -Credential $adminCreds -WindowStyle Hidden -ArgumentList "Remove-Item -Path $file2 -Force" -WorkingDirectory $path -NoNewWindow -PassThru
}

Answer 1

You cannot specify -NoNewWindow and -WindowStyle together, its contradicting.
See Get-Command Start-Process -Syntax for the parameter sets.
I hope below way is what you need. Just use -WindowStyle Hidden.
Start-Process -FilePath "powershell.exe" -Credential $adminCreds -WindowStyle Hidden -ArgumentList "Remove-Item -Path $file2 -Force" -WorkingDirectory $path -PassThru