$ProgressPreference="SilentlyContinue"
$ErrorActionPreference = "Continue"

for ([byte]$c = [char]'A'; $c -le [char]'Z'; $c++)
{
	$variablePath = [char]$c + ':\variables.ps1'

	if (test-path $variablePath) {
		. $variablePath
		break
	}
}

# List installed updates
Write-Host "Listing installed updates"
Get-Hotfix

#Detect O/S and use appropriate Dism command
if ($RunDism){
	$RunDismCount = 2
	While ($RunDismCount -gt 0) {
		try{
			$osName = (Get-WmiObject win32_operatingsystem).caption

			switch -wildcard ($osName)
					{
						"*Server*2012 Standard" {Write-Host "Dism.exe /online /Cleanup-Image /StartComponentCleanup /scratchdir:c:\Windows\Temp"; Dism.exe /online /Cleanup-Image /StartComponentCleanup /scratchdir:c:\Windows\Temp}
						"*Server*2012 Datacenter" {Write-Host "Dism.exe /online /Cleanup-Image /StartComponentCleanup /scratchdir:c:\Windows\Temp"; Dism.exe /online /Cleanup-Image /StartComponentCleanup /scratchdir:c:\Windows\Temp}
						default {Write-Host "Dism.exe /online /Cleanup-Image /StartComponentCleanup /ResetBase"; Dism.exe /online /Cleanup-Image /StartComponentCleanup /ResetBase }
					}
			$RunDismCount = $RunDismCount - 1
		} catch {
			Write-Host "Unable to clean image."
			$RunDismCount = $RunDismCount - 1
		}
	}
# List installed updates
Write-Host "Listing installed updates"
Get-Hotfix
} else {
	Write-Host "Skipping Dism cleanup"
}

if ($SkipCleanup){
	Write-Host "Skipping cleanup"
	exit 0
}

# Remove 7-zip
$version = $ver7zip
$msi_file_name = "7z$version-x64.msi"
$argumentList = '/x "C:\Windows\Temp\' + $msi_file_name + '" /qn'

Write-Host "Removing 7-zip if it exists"
$process = Start-Process -FilePath "msiexec" -ArgumentList $argumentList -NoNewWindow -PassThru -Wait
$process.ExitCode

#Clean up temp files
Write-Host "Removing temp folders"
$tempfolders = @("C:\Windows\Temp\*", "C:\Windows\Prefetch\*", "C:\Documents and Settings\*\Local Settings\temp\*", "C:\Users\*\Appdata\Local\Temp\*")
Remove-Item $tempfolders -ErrorAction SilentlyContinue -Force -Recurse

#Sdelete - clean disk
$wsusService = Get-Service -Name wuauserv
$bitsService = Get-Service -Name bits

#stop bits,wuauserv services (required)
if ($wsusService.Status -eq 'Running') {
  Write-Host "wsus is running"
  Stop-Service $wsusService}
if ($bitsService.Status -eq 'Running') {
  Write-Host "bits is running"
  Stop-Service $bitsService}

Start-Sleep -s 10

#remove the contents only of software distribution directory
Remove-Item -Recurse -Force C:\Windows\SoftwareDistribution\*

#accept license agreement
New-Item -Path "HKCU:\Software\Sysinternals" -name Sdelete -Force
# create reg path and key
New-ItemProperty -Path "HKCU:\Software\Sysinternals\Sdelete" -Name "EulaAccepted" -Value "1"  -PropertyType "Dword"
# edit path/create/key with a value

#run sDelete with switches and wait to complete (runs for 5-10 mins)
Start-process -filepath C:\sDelete\sdelete64.exe -ArgumentList "-q", "-z", "c:" -Wait

start-sleep -s 10
#remove sdelete from the system
Remove-Item -Recurse -Force C:\sdelete
#it is not required to start wuauserv as it is set to manual and bits is set to auto

#Clean Windows Update Registry.
#Delete Windows Update keys, look for AccountDomainSid, SusClientId and AUOptions specifically, if keys are found - delete.
Write-Host "Clean Windows Update Registry"
Try {
	Remove-Item -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate' -Recurse
}
Catch
	{
	Write-Host "WindowsUpdate registry path does not exist, nothing to delete."
}

Try {
	Remove-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate -Name AccountDomainSid -ErrorAction Stop
	Write-Host "AccountDomainSid registry key deleted."
}
Catch {
	Write-Host "AccountDomainSid registry key does not exist, nothing to delete."
}

Try {
	Remove-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate -Name SusClientId -ErrorAction Stop
	Write-Host "SusClientId registry key deleted."
}
Catch {
	Write-Host "SusClientId registry key does not exist, nothing to delete."
}

Try {
	Remove-ItemProperty -Path HKLM:\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU -Name AUOptions -ErrorAction Stop
	Write-Host "AUOptions registry key deleted."
}
Catch {
	Write-Host "AUOptions registry key does not exist, nothing to delete."
}

#Add default Windows Update keys
REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate" /v DisableWindowsUpdateAccess /t REG_DWORD /d 00000001 /f
REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate" /v ElevateNonAdmins /t REG_DWORD /d 00000001 /f
REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU" /v AUOptions /t REG_DWORD /d 00000003 /f

#Clean Event Logs
Write-Host "Clear Event Logs"
wevtutil el | Foreach-Object {wevtutil cl "$_"}