Run this Troubleshooter from Microsoft  You will have to run it twice  Remove both Dell SupportAssist and Dell updates app using this.  Open REGEDIT HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services Delete Dell client management, Dell hardware support, Dell SupportAssist.  Reboot.   
Facing below screen shot, can someone please help on this? [IMAGE]  
Unable to uninstall Dell support assist from my laptop running on Windows 10 Pro