We recently got my Mom a new computer w/ Win10. My sister read on some website about all the junk software that came on a new computer. I advised against it, but when we set up Mom's new computer, the first thing my sister did was go to a website she read about and downloaded some package that was supposed to get rid of all the junk. Four hours later we were still trying to fix all the error messages and make the new computer work.
Being the good and sensitive brother that I am, of course I was very gracious.
The lesson we learned? Unless you are a real power user, and know exactly what you're doing, avoid all the "helpful" software touted to improve your computer's performance. I've no doubt a new computer has some junk, but seriously doubt it's enough to bother somebody who only uses it to check email every few days.