Dell XPS 8920

I had a power outage back in February and my computer struggled to turn back on, but I eventually got it to work. Since then, Dell SupportAssist will pop up every time I start my computer. Usually, it never finds a problem, but occasionally it will say it can't find a boot device, but will boot up just fine. How can I stop it from popping up every single time I turn my computer on? I've tried googling and scouring forums but couldn't find a solution.

Similarly, I wanted to update my Bios to see if that would help, but when I click on "download file", nothing happens. I've tried 3 different browsers and incognito mode.