Device manager not work properly & Modem not found
Check if the service is running, enter msconfig in the Start => Run box. Open the Services tab in the System Configuration utility's window. If the Plug and Play service isn't listed, uncheck the option in the box beside Hide All Microsoft Services.
The option for the Plug and Play service should be enabled and should be shown to be running. If it isn't running, right-click the My Computer entry on the Windows Start menu and choose Manage. On the Computer Management window, expand the entry for Services And Applications and click Services. Make the Standard tab display its contents and locate the entry for Plug and Play. Double-click this entry and set the Startup type to Manual. Next, click the Start button under the Service type in the same window. The service should start, and the window can be closed. Should any warnings appear during this process, just click OK. The Device Manager should now be displaying all of its information
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