Pop-up Asking me to Uninstall Norton 360?

When I start my computer a pop-up asks me to uninstall Norton 360. I suspect it may be either malware or maybe a competitor (McAfee I think) trying to replace Norton 360 as my anti-virus program. I always just use the X in the upper right corner to erase the popup but it's an annoyance to have to do this every time I start up this computer. I don't absolutely need a solution but would like to get rid of this. I did get on RegEdit but am afraid I might mess it up and create a problem, so I left it alone. - Frank