param([switch]$WSUS)

LogMsg "Fix-WindowsUpdate.ps1"

## Delete any existing folder from a previous execution of this script
If ( Test-Path "${Env:WinDir}\SoftwareDistribution.old" )
{
    LogMsg "Deleting ""${Env:WinDir}\SoftwareDistribution.old"""
    Try { Remove-Item "${Env:WinDir}\SoftwareDistribution.old" -Recurse -Force }
    Catch { LogErr $_.Exception.Message }
}

## Stop Background Intelligent Transfer Services and Windows Update
LogMsg "Stopping BITS service"
Try { Stop-Service BITS }
Catch { LogErr $_.Exception.Message }
LogMsg "Stopping wuauserv service"
Try { Stop-Service wuauserv }
Catch { LogErr $_.Exception.Message }

## Rename the SoftwareDistribution folder, forcing Windows Update to recreate all metrics and redownload all updates
LogMsg "Renaming ""${Env:WinDir}\SoftwareDistribution"" to ""${Env:WinDir}\SoftwareDistribution.old"""
Try { Rename-Item -Path "${Env:WinDir}\SoftwareDistribution" -NewName "${Env:WinDir}\SoftwareDistribution.old" -Force }
Catch { LogErr $_.Exception.Message }

## Start Windows Update and Background Intelligent Transfer Services
LogMsg "Starting wuauserv service"
Try { Start-Service wuauserv }
Catch { LogErr $_.Exception.Message }
LogMsg "Starting BITS service"
Try { Start-Service BITS }
Catch { LogErr $_.Exception.Message }

## Delete SoftwareDistribution.old from this execution of this script
If ( Test-Path "${Env:WinDir}\SoftwareDistribution.old" )
{
    LogMsg "Deleting ""${Env:WinDir}\SoftwareDistribution.old"""
    Try { Remove-Item "${Env:WinDir}\SoftwareDistribution.old" -Recurse -Force }
    Catch { LogErr $_.Exception.Message }
}

## If using WSUS, reset authorization with server and detect new updates
If ( $WSUS )
{
    LogMsg "Resetting WSUS authorization and starting update detection"
    Try { Start-Process "${Env:WinDir}\System32\wuauctl.exe" -ArgumentList "/resetauthorization /detectnow" }
    Catch { LogErr $_.Exception.Message }
}