Windows 11 Update Causes Task Manager Bug

The Windows 11 preview update KB5067036 introduced a bug in Task Manager causing multiple instances to run in the background. This affects users by increasing CPU and memory usage.

Bug Impact on Task Manager

This problem occurs when users close Task Manager, only to find it still running in the background. Further attempts to reopen it create additional instances. Tests revealed up to 100 unnecessary background processes, leading to system slowdowns and potential freezes.

Suggested Fixes and Future Updates

Users facing this issue are advised to manually terminate each Task Manager process using the 'End Process' feature or employ the command: taskkill /im taskmgr.exe /f to eliminate all instances at once.

This update is a preview, and Microsoft plans to resolve the bug in the final release within two weeks. Users who have not updated are advised to wait.

Update: 23 Jun 2026