Thanks.
When I saw all that appxpackage stuff in the command line, it looked to me like typical Microsoft jargon, so I just assumed that Voodooshield was blocking a false positive, and I sent it on to Dan. But he wasn't happy with "powershell" -noprofile -noninteractive -inputformat none -executionpolicy bypass , which he says is typical of malware.
Anyways, HitmanPro didn't find anything to speak of on my system, so I am not worried. I will sleep tonight.