SupportAssist is a free tool that Dell installs on PCs to help keep them up-to-date, but it isn't essential. You can always go to the Support page for your specific model and look for updated drivers etc, based on the version numbers (not the dates) when compared to the drivers currently installed on the system. Lots of users have been reporting issues with Dell's SupportAssist after some of the recent Microsoft updates. Dell has suggested uninstalling SupportAssist in Windows and then rebooting. Then download the latest version of SA and install the new one. Keep in mind that Dell doesn't support Win 10 on the Inspiron 2020 (Only Win 7, 64-bit)) so that might be part of the problem [NAME] is having. But Win 10 is supported on the 3668 so try uninstalling/reinstalling the app and see if that helps.
I have a Dell Inspiron 2020 Desktop running Windows 10 64-bit.  Since Windows Security Update KB4284835 was installed on 6/13/18, SupportAssist does not work.  Only get message "SupportAssist is not responding."  Is there a fix for this problem? 
SupportAssist -Is this a "Free Dell Support App" or Not?