While using windows software's, window search bar auto pop-up. When use chrome, chrome search bar shown same behavior. My laptop model is Inspiron 7348. I have tried to fix it many time by disable three finger tapping, four finger tapping, disabling search bar from taskbar, reset windows from cloud as well as from local machine and different methods given on youtube but failed.  Currently I am using Windows 10 Home. 

Please help me to sort out this issue. Is this problem due to window 10 or hardware problem? I have also tried external keyboard and mouse but still this problem exists.