Kepguru.hu?

Today, for the first time while shutting down our computer we noticed that "kepguru.hu" briefly appeared in the far right corner of the System Tray during the shutdown process. What is it? I've Googled it and have only found that it is a Hungarian website that possibly allows the posting of photos on it. It is completely unknown to me including how it got on our computer. (Sometime ago my wife downloaded some photos from a Hungarian website but only today did we see kepguru.hu for the first time...and don't know if it is related to the download months ago or not.) I have searched my computer for kepguru.hu and found nothing. I undated Norton and ran a Quick Scan and found nothing. I undated Malwarebytes and ran a Quick check and found nothing. I ran CCleaner to include the removal of cookies and still kepguru.hu appears very briefly in the right corner of the System Tray during shutdown. What is it? How can I remove or stop it and should I be concerned? Thanks in advance for the help.