The reason I ask is basically that might help us find out what is making it launch.
The good news from my view is that since the file cannot be found, it's already been removed (either from clearing temp files, the malware removal tool, who knows), but there's a shortcut still pointing to where that file used to be, and thus prompting this
message.
If the warning only shows up when you first login, we might find it in your Startup folder.
If it only shows up at a different time it might narrow it down too.
You could try pressing Ctrl+Shfit+Escape, look on the Startup tab and see if anything suspicious or even just unnecessary is listed and disable it there.