I have been having the same problem after this update was installed on my computer without my permission. I have tried unsuccessfully to uninstall the Dell Support Assistant Agent and I keep getting this error message.
Error 1721: There is a problem with this Windows Installer package: A program required for this install to complete could not be run. Contact your support personnel or package vendor. Action StopService. Location C:\Program Files(x86)\SupportAssistAgent\bin\CustomInstallActions.exe. command: stopService
I want this off my computer so I can watch DVDs, listen to music, and watch you tube videos.