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#1
Any and all .MSU's fail to install with 0x8000FFFF unexpected error
What started as Windows Updates hanging, leaking memory, and spiking CPU usage, has now turned into an insane ordeal that after countless hours of troubleshooting I've not been able to pinpoint the source of.
(I fixed the hanging issue by resetting the update components, but that doesn't do a lot of good when they still fail to install anyways)
No matter what KB I'm trying to install, or even non-KB things like C++ redists, I am consistently greeted by an "Update was not installed" message at the ~33% mark, with a 0x8000FFFF error cited as the reason.
sfc /scannow found nothing in need of repair, sans 4 winsxs\mfc90.dll's that have been missing since before I installed SP1 and haven't caused me any issues via their absence in the past.
All that CheckSUR found was an issue with KB2695962, a security fix for Internet Explorer, which not only is unlikely to be the culprit, but is also inconsequential to me as a Chrome user.
Running the Windows Update Troubleshooter told me it had a 0x8005008 error, though after some attempted fixes it seems to now have a 0x80073712 error instead. This error also appeared alongside 0x8000FFFF after attempting to install updates via Windows Updater instead of standalone .msu's
(This was both after I fixed the hanging issue and encountered 0x8000FFFF on its own)
Also worth mentioning, as I'm fairly certain it's related since it started happening at the same time, is that every administrator prompt lists the publisher as Unknown instead of Microsoft.
No amount of searching these error codes has come up with any concrete answers or solutions, so I'm hoping you fine folks here could help me get to the bottom of this.
(Preferably before the 29th, as I've avoided telemetry updates prior to this issue and would like to install Win10 on a separate harddrive while it's still free, but it's really not the end of the world if I miss out)