Googling "reimageplus.com" reveals that it is a pop-up virus. Several sites tell you how to remove. One example:

https://malwaretips.com/blogs/reimageplus-popup-virus/

Not saying you should use this one, but you should look into trusted anti-malware tools to remove.

Another YouTube video on removing it:
https://www.youtube.com/watch?v=GiM1uvxUTQY