Medium
Operating Systems
✓ Solution Verified by Community (0+ upvotes)
How to fix error error-unexpected-mm-map-error in Windows 11
ERROR_UNEXPECTED_MM_MAP_ERROR = 557
Fix based on community reports and expert analysis. Last verified: 2026-08-12
· How we verify fixes
| Error Code | error-unexpected-mm-map-error |
|---|---|
| Affected System | Windows 11 (Microsoft) |
| Difficulty | Medium |
| Estimated Time | 45 min |
| Requires Admin Rights | ⚠️ Yes |
| Requires Reboot | 🔄 Yes |
Solution Steps
- 1 Run the Windows Memory Diagnostic as described in the previous error. Press Windows key + R, type 'mdsched.exe', and restart to test RAM. Faulty RAM is a common cause.
- 2 Update your graphics and chipset drivers. Press Windows key + X, select 'Device Manager', expand 'Display adapters', right-click your GPU, and select 'Update driver'. Also update 'System devices' for chipset drivers.
- 3 Run SFC and DISM. Open Terminal (Admin) and run 'sfc /scannow' followed by 'DISM /Online /Cleanup-Image /RestoreHealth'. This repairs system files that might be causing the mapping error.
- 4 Check for Windows updates. Press Windows key + I, go to Windows Update, and install all pending updates. Microsoft often fixes memory management bugs.
- 5 If you recently installed new software or drivers, try uninstalling them. Press Windows key + I, go to Apps, find the recently installed program, and uninstall it. Then restart and see if the error goes away.
🔍 Didn't work? Enter your GPU and CPU for hardware-specific advice:
🔧 Still having issues?
Describe your exact problem to Error Buddy and get a personalized fix in seconds.
🛠️ Try Error Buddy — It's Free