You can try this...
1) Uninstall Dell SupportAssist and Dell SupportAssist Agent from Control Panel – Programs & Features
2) Remove these folders
3) Click on start run, type regedit, this opens the registry. Make sure the SupportAssistAgent folder does not exists in this location, HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Dell\SupportAssistAgent. If the folder is present right click and say delete.
4) Restart the machine
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