Persistent Malware pop-up

Offensivewizard

Prominent
Apr 12, 2017
1
0
510
For several days i've been experiencing this pop-up on my desktop.
http://imgur.com/a/38llJ
It seems to appear randomly and doesn't show up in task manager as far as i can tell.
I've tried using Windows defender, Malwarebytes, Malwarebytes ADWcleaner, Malwarebytes junkware removal tool, Avira and HitmanPro with no result.

Any assistance or advice would be greatly appreciated.