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.
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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.