Ron, The solution that worked for me was, Downloaded and ran Revo Uninstall to uninstall SupportAssist. Then followed the following from Dell care:- Ensured the following folders had been deleted, or delete them C:/ Program Data / PCDR C:/ Program Data/Supportassist C:/ Program Data/ Dell/Dell data vault C:/ Program Files/Dell/Supportassist C: Program Files/Dell/Dell data vault C:/ windows/Temp (everything inside the folder) However I found that a number of items would not delete, so moved on. Open Edit Registry, Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services Key Delete Dell hardware service,Delete Dell client management service, delete Dell updates. open device manager > system devices: you will see 2 Dell data vault devices, uninstall the second one (bottom one) Reboot Install SupportAssist SupportAssist then installed and could be run. Barnetboy1      
I have a new Inspiron 3891, running windows 11. SupportAssistant stopped working, after using it a couple of times. Rightly or wrongly I uninstalled it using Revo uninstall. Trying to download it again, SupportAssist Installer downloads and runs to 100%, then get message `We were unable to complete the installation. Please reboot your PC and try again.` I have tried this 4 times but get the same result. Any advice would be welcomed in how i overcome this problem.
SupportAssist Installer Installation Failed