$logontime = Get-Content c:\windows\date.txt
$currenttime = get-date -format u
$timespan = (New-TimeSpan -Start $logontime -End $currenttime).TotalDays
if ($timespan -gt 8) {
  New-ItemProperty -Path "HKLM:\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" -Name "ForceUnlockLogon" -Value "1" -PropertyType DWORD -Force | Out-Null
  New-ItemProperty -Path "HKLM:\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" -Name "CachedLogonsCount" -Value "0" -PropertyType String -Force | Out-Null
}