Many Windows 11 users have reported issues with the Device Manager not opening or causing lag on their computers.Troubleshooting tips include running Device Manager from the RUN dialog box by entering 'devmgmt.msc'.Running Device Manager with administrative privileges or via Command Prompt are suggested solutions.Accessing Device Manager through the Computer Management tool or running System Maintenance Troubleshooter are also helpful methods.Scanning and repairing hard drive issues using Command Prompt and performing SFC & DISM commands are recommended.Updating Windows 11 to the latest version and performing a system restore if needed can help resolve Device Manager problems.Keeping Windows 11 updated is crucial for stability and performance improvement.Performing a system restore may revert your PC to a point where the Device Manager functions properly.Following these steps can help in fixing the Device Manager not opening issue on Windows 11.If additional help is needed, users can reach out or seek further assistance.