I updated the definition file and then ran the scan with the result that the login was shown as being infected.
I applied the fix and when I tried to login on another computer I received the message:
"What do you think you're doing Dave" (Source: 2001 A Space Odyssey)
Fortunately I was still logged in on my main computer and restored the "fixed" file from quarantine.
I ran the scan again and received no warnings.