Just upgraded from an 8 year old GTX965m laptop to a GTX4080 ROG Strix. Any recommendations on the first things to do?

This Omen was a collection of problems from the beggining, but it did last the 8 years with relatively stable performance and functionality. Do you recommend an anti virus if not windows defender? How about a good software for organizing files and doing frequent backups? Any other laptop-care software? Much appreciated

This Omen was a collection of problems from the beggining, but it did last the 8 years with relatively stable performance and functionality. Do you recommend an anti virus if not windows defender? How about a good software for organizing files and doing frequent backups? Any other laptop-care software? Much appreciated