Error 0x800f0952 is not a critical system corruption issue — it’s usually a policy or sourcing problem. The fastest fix is using local installation media for .NET Framework 3.5 or bypassing WSUS temporarily. Clearing the Update cache solves it in many other cases.
net stop wuauserv net stop cryptSvc net stop bits net stop msiserver ren C:\Windows\SoftwareDistribution SoftwareDistribution.old ren C:\Windows\System32\catroot2 catroot2.old net start wuauserv net start cryptSvc net start bits net start msiserver 0x800f0952 install
Find .