Whatever you do, do not enter your password - it may be a phishing attempt.
Have you ever done anything with 'LetsCareerUp'?
Is Internet Explorer open? It tends to be tied into Windows rather tightly.
No I have not done anything with them. All I had open while it kept popping up was google chrome and skype. Also when it is up I can't do anything on skype until I cancel it so maybe it is linked to skype somehow?