I had the same thing pop up a couple of days ago. After reading the posts here, I looked in my Control Panel under Uninstall a Program and found the green Folder/Network icon with the name Update PDF Creator as the app. I removed it.

I find it interesting that multiple people had the same thing affect their computers on the same day, with the Same icon, but different names. When I uninstalled the ‘program’, I also got the same message ‘Uninstall DSite update process’. A search on DSite update process on Google resulted in no hits.

Given the above, I believe that this is some sort of malware/virus/adware, albeit an apparently innocuous one. MalwareBytes found 3 Adware items on my system when I ran it the same day the dialog popped up, but removing them did not solve the issue.

I’ll know if it is gone when I do a full power down and restart, although I won’t be completely confident until I have done this a few times).