That's what I feared, the English OS returns "64-bit", not "64". Code: C:\>@for /f %i in ('powershell "(Get-CimInStance CIM_OperatingSystem).OSArchitecture"') do @echo %i 64-bit C:\>_ The non-Powershell variant (the second one) will, when I press the desired number in the configurator, consistently not do anything (it should start WuMgr or WUMT). The variant using Powershell works every time. I'm at a loss, but suspecting the line using sc.exe to query the service state. Will check again once I cleared out over 300GB of Snapshot data from this VM.