Fix NS_E_DRM_UNABLE_TO_OPEN_DATA_STORE (0XC00D2782) Error

Quick answer for advanced users: Close all media apps, delete the %USERPROFILE%\AppData\Local\Microsoft\DRM folder contents (keep the folder), reboot, and reopen your media player.

Why this happens

The DRM data store (drmstore.hds and blacklist.xml) holds your device's media licenses — stuff like songs from iTunes, rented movies, or protected videos from streaming services. When that file gets corrupted (power loss during write, bad sector, abrupt app crash), Windows Media Player, Groove Music, or any DRM-tied app throws 0xC00D2782 and refuses to play anything protected.

The culprit here is almost always a sudden shutdown while Windows was updating the store. I've seen laptop battery deaths cause this more than anything. The fix is brutal but effective — wipe the store and let the OS rebuild it fresh.

Fix steps

Close everything that plays media. That means WMP, Groove, Spotify, Netflix app, VLC (even if it doesn't use DRM — play it safe). Check Task Manager for any lingering wmplayer.exe or Music.UI.exe.
Show hidden files. Open File Explorer, click View, check "Hidden items". You'll need that to see AppData.
Navigate to the DRM folder. Paste this into the address bar:
```
%USERPROFILE%\AppData\Local\Microsoft\DRM
```
Hit Enter. You'll see files like drmstore.hds, blacklist.xml, maybe some .tmp files.
Delete everything inside the folder. Select all (Ctrl+A), delete. Yes, it'll ask for permission — click Yes. If a file says "in use", you missed a media app. Close them all, retry.
Do NOT delete the DRM folder itself. Windows needs that folder to exist. If you accidentally do, recreate it by right-clicking → New → Folder, name it DRM.
Restart your PC. Not a logoff — full restart. This forces Windows to recreate a fresh DRM store on next boot.
Open your media player and try playback. Windows will rebuild the license store silently. You'll need to re-authenticate for any rented content (sign back into Netflix, re-authorize iTunes, etc.).

Alternative fixes if the main one fails

If clearing the DRM folder doesn't work — or you can't delete files because they're locked even after a reboot — try these:

Run the Windows Media Player troubleshooter. Settings → Update & Security → Troubleshoot → Additional troubleshooters → Windows Media Player. It rarely fixes the core issue but will check for service dependencies.
Reset the Windows Media Player library. Press Win + R, type wmplayer.exe /ResetLibrary. This wipes your playlist and library metadata but not licenses — still worth a shot if DRM seems stuck.
Check for file system corruption. Open an admin command prompt and run sfc /scannow. Then DISM /Online /Cleanup-Image /RestoreHealth. I've seen a corrupted system file block DRM store creation.
Create a new user profile. If the store keeps corrupting even after deletion, your profile's registry hive might be damaged. Create a local admin account, log into it, and test playback there.

Prevention tip

This error comes back if you keep losing power mid-playback. Get a UPS for your desktop, or stop yanking the power cord on your laptop when it's playing DRM content. Also — avoid using third-party tools that mess with the DRM folder (like license backup utilities). They corrupt the store more often than they fix it.

One more thing: if you're running Windows 11 22H2 or later, Microsoft moved DRM handling for the Movies & TV app to a different pipeline. That old error still shows up, but the folder path hasn't changed. Don't let anyone tell you to reinstall Windows over this.