Hi, Welcome to the community Try resetting your Internet Explorer settings and try again. Or you can install an application that can check for updates and latest patches for your computer. Please download and install Dell Support Center see this link ; [URL]  Hope this helps,
When I go to my Dell home page (Drivers & Download" for my XPS 8100 and click on the button "Analyze this System for updates", I get this message that "We are unable to analyze your system" Why is that?   What can I do to make it work! To remedy this, I have turned off my Norton but that did not help. Thank you.  
Analyze this System for updates