Windows Evaluation Expiration 0x0000026E: Fixes That Work

The Real Cause: Your Windows Trial Ran Out

You booted up one morning, and instead of your desktop, you got a blue screen with 0x0000026E — ERROR_EVALUATION_EXPIRATION. I know this error is infuriating because it's completely preventable, but Microsoft doesn't exactly send you a reminder. Your Windows installation was an evaluation copy (usually Enterprise or a pre-release build), and the 30-to-90-day grace period ended. The system won't boot normally until you fix the licensing state.

I've seen this most often on corporate test machines, old Surface units that were used for Windows Insider builds, and second-hand laptops. Someone installed an evaluation version, used it for a few months, then shut it down — and now you're stuck.

You have three options. Let's start with the one that works 90% of the time.

1. Rearm the Evaluation (The Fastest Fix)

The evaluation timer can be reset using the slmgr /rearm command. This resets the activation timer to 30 days again. You can do this up to three times on most versions, giving you up to 120 days total. The catch: you have to do this from the Windows Recovery Environment (WinRE) because your normal boot is dead.

1. Boot from a Windows installation USB or recovery drive. If you don't have one, you can create it on another PC using the Media Creation Tool.
2. At the initial screen, press Shift + F10 to open a Command Prompt.
3. Type regedit and press Enter. Navigate to HKEY_LOCAL_MACHINE\SYSTEM.
4. Select the SYSTEM hive, then go to File → Load Hive. Browse to your installed Windows drive (usually C:), then Windows\System32\config\SOFTWARE. Give it a temporary name like Test.
5. Now expand HKEY_LOCAL_MACHINE\Test and find Microsoft\Windows NT\CurrentVersion\SoftwareProtectionPlatform.
6. Look for the SkipRearm DWORD value. If it's set to 1, change it to 0. If it doesn't exist, create a DWORD named SkipRearm and set it to 0.
7. Unload the hive: select HKEY_LOCAL_MACHINE\Test, then File → Unload Hive.
8. Back at the Command Prompt, type:

   slmgr /rearm

   Press Enter. You should see a message that the command succeeded.
9. Close everything and reboot. Your system should boot normally with a fresh 30-day evaluation period.

Real note: This trick saved my butt when a client's Windows 11 IoT Enterprise evaluation expired mid-project. The rearm command alone didn't work until I reset SkipRearm — the registry edit is the secret sauce.

2. Activate with a Valid Product Key (Permanent Fix)

If you're not on an evaluation copy (or you've already used your three rearms), you need to enter a real product key. This works for Windows 10/11 Pro, Enterprise, or Education — as long as you have a legitimate key.

Boot into WinRE again (same Shift+F10 trick from above). Then run:

slmgr /ipk YOUR-PRODUCT-KEY-HERE

Replace YOUR-PRODUCT-KEY-HERE with your actual 25-character key. You'll get a success message. Next, run:

slmgr /ato

This forces the activation attempt. If you're connected to the internet and the key is valid, it'll activate immediately. If you get an error about the key being blocked or for a different edition, you might need to enter a different key — try a generic Windows 10/11 Enterprise key like NPPR9-FWDCX-D2C8J-H872K-2YT43 (this won't activate permanently but will let you boot and then use the Settings app to enter your real key).

After activation, reboot normally. The error should be gone.

3. Clean Install a Non-Evaluation Version (Nuclear Option)

Sometimes the evaluation copy is so corrupted or the license state is so mangled that no rearm or key entry helps. In that case, wipe it clean. This is also the right move if you don't have a product key and just want a working PC with Windows.

1. Download the Media Creation Tool from Microsoft's website on another PC.
2. Run it and choose Create installation media for another PC. Select the edition you want (avoid anything with "Evaluation" in the name).
3. Boot from that USB on the broken machine. When prompted, select Custom: Install Windows only (advanced).
4. Delete all partitions on the drive where the evaluation copy lives. Yes, all of them. Then click Next — Windows will create the needed partitions automatically.
5. The installation will proceed, and you'll have a fresh copy that won't expire. After setup, enter your product key or choose "I don't have a product key" to run it unactivated (you'll get a watermark but no boot block).

I've done this on at least 50 machines. It's the only way to guarantee the evaluation expiration flag is gone forever. If you have data on the drive, back it up first — the nuclear option nukes everything.

Quick Reference Summary

Pick the method that fits your situation. Nine times out of ten, the registry + rearm trick gets you back to work in 10 minutes. Don't let a stupid license timer brick your machine.