Hello rintobs and welcome to Seven Forums.
It appears that you have a free product called Express-Files on your computer. It's supposed to be a search tool with a built in download manager.
Express Files
The pop-up message you received wasn't attached to your post. I'm guessing it was something like "Do you really want to uninstall this?" A lot of programs try to convince people to keep their product installed and offer an "are you sure" message. If that's the mesage you get, I'd say it's OK to uninstall the program. Once you do, I'd also recommend you run a full antimalware scan just in case it's not what I think it is. You could also use Malwarebytes
free as a secondary scan.
Malwarebytes : Free anti-malware, anti-virus and spyware removal download