Fix 0XC00D11CF: Windows Media Player CD Drive in Use Error

You're trying to rip a CD or play a disc in Windows Media Player, and bam — 0xC00D11CF with that annoying message: "The CD drive is in use by another user." You're the only user. So what gives? I've seen this a dozen times. Let's cut through the noise.

The Fast Fix: Kill the Locked Process

Most of the time, this error happens because a background process — usually svchost.exe or explorer.exe — has a handle on the drive. Here's how to break it loose:

1. Open Task Manager (Ctrl + Shift + Esc).
2. Go to the Details tab.
3. Find explorer.exe, right-click it, and select End task. Your desktop will vanish — don't panic.
4. In Task Manager, click File > Run new task.
5. Type explorer.exe and hit Enter. That restarts the shell.
6. Try your CD again. Should work now.

That fixed it for a client last month who'd left a CD in the drive after a remote desktop session. The remote session's explorer.exe instance held the drive hostage.

If that doesn't do it, use Process Explorer (from Microsoft Sysinternals). It's more surgical:

1. Download and run Process Explorer.
2. Press Ctrl + F and search for your drive letter (e.g., D:).
3. You'll see every process with an open handle to that drive.
4. Right-click the process and Close Handle — or just kill the process if it's safe.

Why This Happens

Windows Media Player isn't smart about detecting stale locks. When any process — like a file manager, a backup tool, or even a game that tried to access the CD — doesn't release its handle cleanly, Windows reports the drive as "in use." The error code itself is from the old Windows Media Player SDK, meaning this bug's been around since Windows Vista. The real culprit is usually a hung thread in svchost.exe that manages media services.

The explorer.exe restart clears all those stale handles for the current user session. No fuss, no reboot.

Less Common Variations

Sometimes the fix above doesn't work. Here's what else I've run into:

• Third-party CD burning software: Nero or Roxio can lock the drive. Check their tray icons and close them, or kill them in Task Manager.
• Fast User Switching: If another user account is signed in (even if you switched out), their session might hold the drive. Log them off via Task Manager > Users tab.
• Windows Media Player Network Sharing Service: This service (WMPNetworkSvc) can interfere. Stop it in Services.msc, then try again.
• USB CD/DVD drives: Faulty USB power management can lock the device. Unplug it, wait 10 seconds, plug it back in. Try a different USB port (preferably USB 2.0 if you have one).
• Corrupted registry key: Rare, but the HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Player\RecentFileList can get corrupted. Delete that key (back it up first), then restart Media Player.

How to Prevent This

You can't stop every lock, but these steps cut the chances:

• Always eject CDs via Windows (right-click drive > Eject) instead of just yanking them out.
• Before a remote desktop session, eject any disc in the drive. Remote sessions love to hold handles.
• Close Windows Media Player completely before putting your PC to sleep or switching users.
• Run a disk check on the drive occasionally — bad sectors can cause read hangs that lock the drive until you reboot.

That covers it. Next time you see 0xC00D11CF, just restart Explorer — 9 times out of 10, you're done in 30 seconds.