I had the same issue 'supportAssist not responding'. This is how I fixed the issue:
1. Check MS history update for KB4284835 installed on June 12, 2018. If you have this
one installed go to step 2.
2. Uninstall DellsupportAssist. then restart your computer.
3. Go to Dellsupportassist website to download and install Dellsupportassistinstaller. Or
you could use @DellFanHungary posted on this site on June 14, 2018. Make sure you
run as admin. It worked for me. Hope this helps !!!
It was in the x64 version
not in the x86 version
C:\Program Files (x86)\Dell\SupportAssistAgent\bin\Resources