SupportAssist hasn't run software updates for several weeks. Today I tried to uninstall it on my Dell Inspiron 15 5550, running  Windows 11, laptop and reinstall from the Dell website. It will not uninstall. It showed uninstalling for the past several hours.  I clicked out, shut down Settings, and went back.  It showed that it had not uninstalled.  How do I uninstall SupportAssist?