Thank you for your message. I will be glad to assist you on this. Please follow the instructions on below link & let me know if the error is the same. 
I got a problem when reinstall SupportAssist. I have uninstalled it, but when I run the .exe, it show up "Installation cancelled. The lastest version fo SupportAssist has already installed." My pc is Inspiron 15 3567. Please help me, thanks you!
Problem with reinstall SupportAssist