Shortly after a standard boot, Windows 8.1 hangs with Task Mgr. reporting 100% disc traffic (R/W) occupying it but not attributing it to a program. However, it does report GWX-associated executables as loaded, so even though there's no pop-up (or maybe because
there's no pop-up), I think the hang has something to do with trying to get Win 10. I'm trying to delete or neutralize all files in directory SXS with names GWX*.exe, but even though it tells me I've successfully xferred "ownership" of the files to myself (or an admin or users generally -- I've tried all), and reports that I have the required permission, when I try to alter the file name, it says I need someone else's
permission to alter them -- at least when I do a safe or diagnostic boot to get to the process to do this.
It's a close race even to do a reboot into safe mode before the hang takes hold.