Unexpected computer restart request to complete installlation

My laptop has just asked me to restart to complete installation and on checking it refers to a Norton product.

I have made no change to my Norton product which is in mid-contract and cannot see any record of installations on my Norton Performance screen.

Norton is showing as fully functional.

I don't want to be unprotected but likewise don't want to complete an installation if I don't know what it's for.

Has anyone any ideas as to how I can find out what is going on and how I can decide what to do next?

Thanks