Do I have a Norton problem or something else?

I have used Norton for 12 years faithfully & never had trouble. When I download a file & double click to open it, hundreds of windows open & close continuously. A friend said I may have a virus so I used Norton's PC Check-up utility. It only wanted me to do a Power Boost for faster performance. I also have Windows Defender, have Windows Updates automatically & it is up to date. I have Windows Vista Home 32 bit, on a Dell. Norton IS version: 16.8.3.6.

 

Could this be a virus or do you think it is something else? This has been going on for about 2 weeks but I haven't had time to search for a solution. Thank you very much in advance for any solutions you can give. I think it is so nice for people to give their time to help others!