It's possible it was giving a reaction to the one already found and quarantined.
Artemis detections are unknowns which are submitted automatically to McAfee Labs for analysis. They may or may not be malicious.
I altered your post to include the Artemis number and moved it to that section so the labs can see it when they patrol this section. Hopefully they will answer your question.
In the meanwhile, if everything works as it should, make sure your system is totally up to date in all aspects, especially Internet Explorer and its add-ons, whether or not you use it.
A repair install usually winds the clock back considerably so many updates are most likely awaiting.
I suggest scanning using GetSusp and perhaps also the free version of Malwarebytes (after updating it) both of which are listed here: https://community.mcafee.com/docs/DOC-2168
Make sure you read the instructions for GetSusp and enter your email address before running it.
The Detection Artemis!226F985A2463 was a false alarm. The file has been marked clean in our database and the detection removed on 30th April (04/30). Since this is a clean file it is not the trojan that was detected in your computer.