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0x800f081f

Windows could not find the files it needs to install an update or feature, most often .NET Framework 3.5.

How to fix it

1. Make sure the PC is online and not set to use WSUS only (company PCs: ask IT).
2. Turn on .NET Framework 3.5 from Control Panel > Programs > Turn Windows features on or off.
3. If that fails, mount a Windows ISO of the same version and run: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess (replace D: with the ISO drive letter).
4. Open Command Prompt as administrator (search "cmd", right-click, Run as administrator).
5. Run: DISM /Online /Cleanup-Image /RestoreHealth and wait for it to finish (it can sit at 20% for a while).
6. Then run: sfc /scannow
7. Restart the PC.

Is it serious?

Fixable. The ISO method works when nothing else does.