I cant download security essentials because I get an insufficient permission mes

[ubetcha1000]

Does anybody know why I keep getting the message of insufficient permission after I downloaded Security Essentials? It won't let me run the exe file after i downloaded this program. I downloaded the program using the Google Chrome browser.

 

[WyomingKnott]

Are you logged in to an Administrator-privileged account? Can't install most things without that level of access.