How to Fix PIN or Password Not Working After a Windows Update
You’ve just installed the latest Windows update, restarted your computer, and suddenly—you can’t log in. Your PIN or password, which worked perfectly fine yesterday, is now being rejected. This issue is surprisingly common after major updates in Windows 10 and Windows 11. While it can feel alarming (and inconvenient), the good news is that there are several proven ways to fix it.
In this article, we’ll walk you through the reasons this happens, troubleshooting steps with error examples, FAQs, and community resources where others have faced—and solved—the same problem.
Why Does This Happen?
When Windows updates, it sometimes modifies system settings or authentication services. Common causes include:
Corrupted cached credentials – Updates may break the cached PIN or password files.
Broken Windows Hello services – The Windows Hello service that handles PIN and biometric login may fail to start correctly.
Account sync issues – If you use a Microsoft account, an update might desync credentials temporarily.
Keyboard layout changes – After an update, the default input language might switch (e.g., from US to UK layout).
System file corruption – Damaged files can interfere with login authentication.
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