Windows · Office · Apps troubleshooting
When your PC acts up, start here.
Type the error code or describe what went wrong. Every guide starts with the safest fix first and tells you exactly when to move on to the next step.
C:\> sfc /scannow
Verification 100% complete.
! found corrupt files, repaired some
C:\> DISM /Online /Cleanup-Image /RestoreHealth
[==========100.0%==========]
✓ The restore operation completed successfully.
C:\> _
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What’s going wrong?
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Latest fixes
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Automatic registration failed at join phase: what it means and how to fix it
Seeing “Automatic registration failed at join phase” in the User Device Registration log? Find out if it matters, how to stop it,…
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LmCompatibilityLevel: LAN Manager authentication levels explained
What LmCompatibilityLevel 0 to 5 means, the Windows default, how to check and change it in Group Policy or the Registry, and…
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How to stop Windows 11 from updating your graphics driver
Stop Windows 11 from replacing your NVIDIA, AMD or Intel graphics driver: exclude drivers from Windows Update with Group Policy or the…
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SFC offline: how to run sfc /scannow from recovery in Windows 11 and 10
Run SFC offline when Windows won’t start: open Command Prompt in recovery, find the right drive letter, and use sfc /scannow with…
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Windows Update service missing: how to restore it in Windows 11 and 10
Windows Update service missing from services.msc? Check with sc query, scan for malware, run SFC and DISM, use System Restore or a…
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Operating system loader failed signature verification: how to fix it
Operating System Loader failed signature verification is a Secure Boot error. Remove USB drives, restore the default Secure Boot keys, rebuild the…
How every guide is built
01 / THE EXACT PROBLEM
We start from the error message or symptom you actually see, and explain what causes it in plain words.
02 / SAFEST FIX FIRST
Quick, low-risk steps come first. Anything that changes system settings comes later, with a warning.
03 / WHERE IT APPLIES
Each guide says which Windows or app versions it covers, so you don’t follow steps meant for a different system.
04 / KEPT CURRENT
When Windows or Office changes, guides are reviewed and the update date is shown at the top.