You can try this...

1)      Uninstall Dell SupportAssist and Dell SupportAssist Agent from Control Panel – Programs & Features

2)      Remove these folders

1. C:\Program Files\Dell\ DellDataVault
2. C:\Program Files\Dell\ SupportAssist
3. Click start & Run, Type- %ProgramData% and enter. Delete the PCDR folder.
4. Click start & Run, Type- %AppData% and enter. Delete the PCDR folder.

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