It sounds like you downloaded the wrong thing for McAfee's Stinger tool. It's best not to "update" Stinger. Simply download the newest version and replace the old. Here's the actual download link for the newest version of Stinger:
HOpe this helps.
I've downloaded an update for Stinger with a file association of .opt. How can I open this? I've been into Filext but that can't help me [or if it can, I don't know how!]. Any advice please?