My PC came with Windows 7 Pro installed. Subsequently I upgraded to Windows 10. After a period using that I decided to revert to W 7 and that is the OS I'm now running. However, I believe that W 10 is still lurking somewhere in the bowels of the computer. I am using a little app called Never 10 from Gibson Research Corp. which is designed to prevent future installation of W 10 and to find and allow the removal of W 10 if present. I am wondering if Norton 360 will in any way interfere with the running of Never 10, which seems to be taking a very, very long time to come up with results.