Solved Strange user infection?

Sorry I don't understand your question.

My concern is to discover what created that user account..
 
Humm ok. I thought it was some malware since I don't have any strange user on other PC's. I will remove it then.

Maybe it was created by some software, idk...

But thank you for your opinion! :)

Have a nice week.
 
I found what the problem is, but I don't know how to rollback this sh**.

It's ESET ANTI THEFT. When you enable it, it creates this random account. If you disable and enable it many times, you will end up with a huge number of accounts. I removed it from windows but my files keep showing the account associated to it :s