Windows Activation Error

0xC004F064: Non-genuine grace period expired

0xC004F064 means Windows failed genuine validation and the grace period granted has ended. It typically appears on systems that were previously activated with pirated tools, once Microsoft's check runs. Windows keeps running but with restrictions; the lasting fix is activating with a genuine key.

Most common causes

• The system was previously activated with a KMS/keygen-type pirated tool
• The key in use was later revoked by Microsoft
• License validation files (tokens.dat) were tampered with
• An evaluation edition has expired

Step-by-step fix

1. View the license state and channel with "slmgr /dlv" in an elevated Command Prompt.
2. Remove pirated-tool leftovers: suspicious Task Scheduler entries and unknown services; then run a full scan with Windows Security.
3. Install your genuine key with "slmgr /ipk KEY" and activate with "slmgr /ato".
4. If the error persists, rebuild the license store (stop sppsvc, rename tokens.dat) and enter the key again.
5. If the system was heavily modified, do a clean install with the official Media Creation Tool and enter the key during setup.

Frequently Asked Questions

Other activation errors

• 0xC004C003Product key blocked
• 0xC004C008Key usage limit exceeded
• 0xC004F050Invalid product key (edition mismatch)
• 0xC004F074KMS server could not be reached